QCLab - Recent changes [en]

Hwang, Myung-Joong

Mahnsoo.Choi — Mon, 10 Aug 2026 18:05:08 GMT

Nonreciprocal and Geometric Frustration in Dissipative Quantum Spins

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	Myung-Joong Hwang is an Associate Professor of Physics at Duke Kunshan University in China and an Associate Professor of Practice at Duke University in U.S. His research focuses on uncovering novel quantum phenomena and designing controlled quantum systems based on superconducting circuits and AMO systems such as ion-traps and cold atoms with optical cavities and harnessing them for quantum computing and quantum sensing. He has a Ph.D in physics from Pohang University of Science and Technology, South Korea. Before joining Duke Kunshan, he was a postdoctoral researcher at the Institute of Theoretical Physics at Ulm University, Germany.		Myung-Joong Hwang is an Associate Professor of Physics at Duke Kunshan University in China and an Associate Professor of Practice at Duke University in U.S. His research focuses on uncovering novel quantum phenomena and designing controlled quantum systems based on superconducting circuits and AMO systems such as ion-traps and cold atoms with optical cavities and harnessing them for quantum computing and quantum sensing. He has a Ph.D in physics from Pohang University of Science and Technology, South Korea. Before joining Duke Kunshan, he was a postdoctoral researcher at the Institute of Theoretical Physics at Ulm University, Germany.

	==Contributions==		==Nonreciprocal and Geometric Frustration in Dissipative Quantum Spins==

			* Speaker: [[Hwang, Myung-Joong\|Myung-Joong Hwang]] (Duke Kunshan University, China)
			* Event: [[Quantum Technology Workshop 2026]]

			Abstract: Nonreciprocal interactions create conflicting dynamical objectives that cannot be simultaneously satisfied, leading to nonreciprocal frustration. Geometric frustration, on the other hand, arises when conflicting static objectives in energy minimization cannot be satisfied. In this work, we show that nonreciprocal interaction among three collective quantum spins, mediated by a damped cavity, induces not only nonreciprocal frustration, intrinsic to nonreciprocity, but also geometric frustration with a remarkable robustness against disorder. It therefore ensures that the accidental degeneracy for steady states remains intact even when the system is perturbed away from a fine-tuned point of enhanced symmetry, in sharp contrast to the equilibrium case. Leveraging this finding, we identify a nonreciprocal phase transition driven by both geometric and nonreciprocal frustration. It gives rise to a time-dependent state, which shows chiral dynamics along a geometry shaped by the geometric frustration and dynamically restores the broken discrete symmetries. Moreover, it constitutes a time-crystalline order, with multiple harmonics set by an emergent time scale that exhibits critical slowing down. We discuss the potential experimental realizations using a three-component spinor BEC-cavity system, where our finding manifests as a geometric frustration in the structural phase transition and chiral dynamics of the frustrated self-organized BECs. We demonstrate the feasibility of experimental observation under realistic conditions.

			==Other Contributions==
	* [[Quantum phase transition and universal dynamics in the Rabi model]]		* [[Quantum phase transition and universal dynamics in the Rabi model]]

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Bruder, Christoph

Mahnsoo.Choi — Mon, 10 Aug 2026 12:10:27 GMT

Quantum Synchronization

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	For more details, visit the [https://quantumtheory-bruder.physik.unibas.ch/en/ Web page of his research group] at the University of Basel.		For more details, visit the [https://quantumtheory-bruder.physik.unibas.ch/en/ Web page of his research group] at the University of Basel.

			==Quantum Synchronization==

			* Speaker: [[Bruder, Christoph\|Christoph Bruder]] (University of Basel, Switzerland)
			* Event: [[Quantum Technology Workshop 2026]]

			Experimental progress in optomechanical systems, in trapped-ion setups,
			and in superconducting circuit-QED architectures has motivated the study
			of synchronization in quantum systems. In my talk I would like to
			describe theoretical approaches to the synchronization problem for
			quantum oscillators and discuss some of the issues and open questions.


	[[Category:Quantum Technology Workshop 2026]]		[[Category:Quantum Technology Workshop 2026]]
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Quantum Technology Workshop 2026

Mahnsoo.Choi — Mon, 10 Aug 2026 02:25:38 GMT

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Park, Seung

Mahnsoo.Choi — Sun, 09 Aug 2026 14:40:39 GMT

Dual-channel multi-product formula

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	Seung Park received his B.S. in Physics from Korea University in 2016 and his Ph.D. in Physics from the same university in 2025, with a thesis on improving variational quantum algorithms. He is currently a postdoctoral researcher at Yonsei University. His research interests include quantum machine learning, variational quantum algorithms, quantum simulation, and other near-term quantum algorithms.		Seung Park received his B.S. in Physics from Korea University in 2016 and his Ph.D. in Physics from the same university in 2025, with a thesis on improving variational quantum algorithms. He is currently a postdoctoral researcher at Yonsei University. His research interests include quantum machine learning, variational quantum algorithms, quantum simulation, and other near-term quantum algorithms.

			==Dual-channel multi-product formula==

			* Speaker: [[Park, Seung\|Seung Park]] (Yongsei University, Korea)
			* Event: [[Quantum Technology Workshop 2026]]

			Product formula (PF) is a promising approach for simulating quantum systems on near-term digital quantum computers. Achieving a desired simulation precision typically requires a polynomially increasing number of Trotter steps, which remains challenging due to the limited capabilities of current quantum hardware. To alleviate this issue, algorithmic error-mitigation techniques such as the multi-product formula (MPF) have been introduced to suppress Trotter errors under restricted hardware resources. In this work, we propose a dual-channel MPF protocol that utilizes the average of a PF and its reversed-sequence counterpart without increasing circuit depth. Our method enables the target simulation precision to be reached with approximately half the circuit depth compared to conventional MPF schemes. This provides substantial error reduction on noisy hardware while implementing a well-conditioned MPF. We also demonstrate our algorithm through numerical simulations under a noise model, showing that our proposal achieves significantly smaller errors.

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Ren, Changliang

Mahnsoo.Choi — Sun, 09 Aug 2026 09:04:36 GMT

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 His research focuses on quantum physics, quantum optics, and quantum information theory, with particular interests in quantum correlations, quantum measurement, quantum metrology, and quantum sensing. He has published more than 70 papers in leading international journals, including Physics Reports, Physical Review Letters, Photonics Research, Quantum Science and Technology etc. His recent work explores the fundamental limits of quantum resource recycling, sequential quantum measurements, and quantum-enhanced sensing.
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Chen, Dongni

Mahnsoo.Choi — Sat, 08 Aug 2026 08:00:50 GMT

Symmetry-Restoration Quantum Mpemba Effect in Weakly $\mathbb{Z}_2$-Symmetric Open Quantum Systems

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	Dongni Chen received her Ph.D. in Physics from the Institute of Theoretical Physics, Chinese Academy of Sciences, in 2022. She subsequently conducted postdoctoral research at Korea University and then joined the College of Science, Shantou University as a Lecturer in 2024. Her research focuses on nonequilibrium quantum dynamics in open quantum systems, including entanglement dynamics, dissipative phase transitions, and symmetry-related quantum phenomena.		Dongni Chen received her Ph.D. in Physics from the Institute of Theoretical Physics, Chinese Academy of Sciences, in 2022. She subsequently conducted postdoctoral research at Korea University and then joined the College of Science, Shantou University as a Lecturer in 2024. Her research focuses on nonequilibrium quantum dynamics in open quantum systems, including entanglement dynamics, dissipative phase transitions, and symmetry-related quantum phenomena.

			==Symmetry-Restoration Quantum Mpemba Effect in Weakly $\mathbb{Z}_2$-Symmetric Open Quantum Systems==

			* Speaker: [[Chen, Dongni\|Dongni Chen]] (Shantou University, China)
			* Event: [[Quantum Technology Workshop 2026]]

			The quantum Mpemba effect (QME) describes anomalous relaxation in which a state initially farther from equilibrium reaches the steady state faster than one initially closer to it. In this talk, I will present a symmetry-restoration QME in the weakly $\mathbb{Z}_2$-symmetric dissipative Dicke model, where the full Liouvillian preserves parity symmetry although individual quantum jumps do not. Using entanglement asymmetry to characterize parity restoration, we show that coherent-product states exhibit conventional relaxation, whereas cat-like superposition states display clear Mpemba behavior. A Liouvillian spectral analysis reveals that this anomalous relaxation originates from initial-state mode filtering: coherent superposition suppresses the slowest non-stationary Liouvillian mode, allowing faster decay channels to dominate the dynamics. The same mechanism operates in both the normal and superradiant regimes, while the low-lying Liouvillian spectrum determines the detailed relaxation profile. These results demonstrate that the quantum Mpemba effect can emerge without strong symmetry conservation and provide a new route for controlling nonequilibrium relaxation through initial-state engineering.

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Li, Jiahui

Mahnsoo.Choi — Fri, 07 Aug 2026 05:06:52 GMT

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	Dr. Jiahui Li is a Lecturer at the School of Physics, Henan University, China. She obtained her Ph.D. in Optics from Huazhong University of Science and Technology (HUST), Wuhan, in 2017. Following her doctoral studies, she conducted postdoctoral research at the Institute of Theoretical Physics, Chinese Academy of Sciences (ITP-CAS) in Beijing, and later at the Beijing Computational Science Research Center (CSRC). Her core expertise lies in the dynamical evolution of open quantum optical systems, with a sustained focus on dissipative phase transitions, the classical-quantum chaos correspondence, and related nonequilibrium quantum phenomena.		Dr. Jiahui Li is a Lecturer at the School of Physics, Henan University, China. She obtained her Ph.D. in Optics from Huazhong University of Science and Technology (HUST), Wuhan, in 2017. Following her doctoral studies, she conducted postdoctoral research at the Institute of Theoretical Physics, Chinese Academy of Sciences (ITP-CAS) in Beijing, and later at the Beijing Computational Science Research Center (CSRC). Her core expertise lies in the dynamical evolution of open quantum optical systems, with a sustained focus on dissipative phase transitions, the classical-quantum chaos correspondence, and related nonequilibrium quantum phenomena.

			==Spin fluctuations in the dissipative phase transitions of the quantum Rabi model==

			* Speaker: [[Li, Jiahui\|Jiahui Li]] (Henan University, China)
			* Event: [[Quantum Technology Workshop 2026]]

			We will present our research on dissipative phase transitions in the quantum Rabi model in this report. We highlight that significant spin fluctuations persist in the system’s stationary state, which have important consequences for the phase diagram and critical properties. In the second-order phase transition, there is a significant suppression of the order parameter and the appearance of non-universal factors, which directly reflect the spin populations. Furthermore, upon entering a parameter regime where mean-field theory predicts a tricritical phase, we find a first-order phase transition due to the unexpected collapse of superradiance. An accurate and physically transparent description going beyond mean-field theory is established by combining exact numerical simulations, the cumulant expansion, and analytical approximations based on reduced master equations and an effective equilibrium theory.


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Jin, Lijing

Mahnsoo.Choi — Thu, 06 Aug 2026 13:21:31 GMT

Toward Scalable Two-Dimensional Fluxonium Quantum Processors: Challenges and Solutions

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 Lijing Jin obtained his Ph.D. in theoretical physics through a joint training program between Université Grenoble Alpes and the French National Centre for Scientific Research (CNRS). He is currently the tech lead of the quantum chip design team at Guangdong–Hong Kong–Macao Greater Bay Area (Guangdong) Quantum Science Center, where his work focuses on the development of high-fidelity, scalable fluxonium-based superconducting quantum processors. His research interests include the theoretical modeling of superconducting quantum devices, electromagnetic simulation and validation methodologies, and the development of automated toolchains for quantum chip design. Previously, he was a postdoctoral researcher at the Beijing Computational Science Research Center, working on quantum optomechanics. He later joined Baidu Research as a senior researcher and led the quantum chip design team, where he was responsible for the development of superconducting quantum chips and related technologies.
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Shi, Tao

Mahnsoo.Choi — Wed, 05 Aug 2026 23:59:28 GMT

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	==Many-body Quantum Phases in Micro-wave Shielded Polar Molecules==		==Many-body Quantum Phases in Micro-wave Shielded Polar Molecules==

			* Speaker: [[Shi, Tao\|Tao Shi]] (Institute of Theoretical Physics, CAS, China)
			* Event: [[Quantum Technology Workshop 2026]]

	abstract: We show that the effective interaction potential between microwave-shielded polar molecules consists of an anisotropic van der Waals-like shielding core and a modified dipolar interaction. This effective potential is validated by comparing its scattering cross-sections with those calculated using intermolecular potential involving all interaction channels. It is shown that a scattering resonance can be induced under microwave fields and a field-link tetramer bound state emerges. With the effective potential, we further study the Bardeen-Cooper-Schrieffer pairing, Bose-Einstein condensations, and supersolid phases in microwave-shielded molecular gas. We show the fermionic superfluid critical temperature drastically enhanced near the resonance, a formation of self-bound droplets with reduced condensate fraction resembling a magnified Helium 4, and a formation of supersolidity controlled by the microwave elliptical angle.		abstract: We show that the effective interaction potential between microwave-shielded polar molecules consists of an anisotropic van der Waals-like shielding core and a modified dipolar interaction. This effective potential is validated by comparing its scattering cross-sections with those calculated using intermolecular potential involving all interaction channels. It is shown that a scattering resonance can be induced under microwave fields and a field-link tetramer bound state emerges. With the effective potential, we further study the Bardeen-Cooper-Schrieffer pairing, Bose-Einstein condensations, and supersolid phases in microwave-shielded molecular gas. We show the fermionic superfluid critical temperature drastically enhanced near the resonance, a formation of self-bound droplets with reduced condensate fraction resembling a magnified Helium 4, and a formation of supersolidity controlled by the microwave elliptical angle.

Chang, Yue

Mahnsoo.Choi — Wed, 05 Aug 2026 23:58:31 GMT

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	==Few-Photon Bound States in the Continuum==		==Few-Photon Bound States in the Continuum==

			* Speaker: [[Chang, Yue\|Yue Chang]] (Beijing Academy of Quantum Information Science, China)
			* Event: [[Quantum Technology Workshop 2026]]

	Bound states in the continuum (BICs) can confine photonic excitations in open systems without relying on conventional cavities or photonic band gaps, making them promising for long-lived quantum storage and few-photon control. In this talk, I will present our recent work on single- and two-photon BICs. For single-photon BICs, we develop a capture–reshape–release protocol based on temporal control of a giant atom coupled to a waveguide. For two-photon states, we establish a no-go theorem for interaction-active BICs supported by a single emitter. We then investigate two-photon quasi-BICs in giant-atom systems and determine how their decay rates scale with the system parameters.		Bound states in the continuum (BICs) can confine photonic excitations in open systems without relying on conventional cavities or photonic band gaps, making them promising for long-lived quantum storage and few-photon control. In this talk, I will present our recent work on single- and two-photon BICs. For single-photon BICs, we develop a capture–reshape–release protocol based on temporal control of a giant atom coupled to a waveguide. For two-photon states, we establish a no-go theorem for interaction-active BICs supported by a single emitter. We then investigate two-photon quasi-BICs in giant-atom systems and determine how their decay rates scale with the system parameters.

Tang, Gaoming

Mahnsoo.Choi — Wed, 05 Aug 2026 23:57:30 GMT

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	==Transverse thermophotovoltaics==		==Transverse thermophotovoltaics==

			* Speaker: [[Tang, Gaoming\|Gaoming Tang]] (Graduate School of Chinese Academy of Engineering Physics, China)
			* Event: [[Quantum Technology Workshop 2026]]

	Transverse thermophotovoltaics has been conceptually proposed as a paradigm distinct from conventional junction-based photovoltaics. The talk will introduce a microscopic formalism of this effect in which a transverse electric current emerges in a two dimensional metal sheet via nonreciprocal surface plasmon polaritons driven by near-field thermal radiation. This theoretical formalism incorporates the electron-photon interaction by integrating electronic transition factor governed by energy-momentum conservation, the photon flux factor encoding the nonreciprocal surface modes, and their directional coupling. Transverse thermophotovoltaics opens new avenues for active nanoscale thermal energy conversion. Furthermore, I will extend this framework to the photonic spin Seebeck effect in a similar setup, demonstrating how Rashba spin-orbit coupling in an electron-doped transition metal dichalcogenide monolayer converts circularly polarized thermal photons into electronic spin to induce a spin current.		Transverse thermophotovoltaics has been conceptually proposed as a paradigm distinct from conventional junction-based photovoltaics. The talk will introduce a microscopic formalism of this effect in which a transverse electric current emerges in a two dimensional metal sheet via nonreciprocal surface plasmon polaritons driven by near-field thermal radiation. This theoretical formalism incorporates the electron-photon interaction by integrating electronic transition factor governed by energy-momentum conservation, the photon flux factor encoding the nonreciprocal surface modes, and their directional coupling. Transverse thermophotovoltaics opens new avenues for active nanoscale thermal energy conversion. Furthermore, I will extend this framework to the photonic spin Seebeck effect in a similar setup, demonstrating how Rashba spin-orbit coupling in an electron-doped transition metal dichalcogenide monolayer converts circularly polarized thermal photons into electronic spin to induce a spin current.

Quantum Coffee

Mahnsoo.Choi — Wed, 05 Aug 2026 23:52:00 GMT

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	[[File:QuantumCoffee2026a.jpg~~\|thumb~~\|500px\|link=]]		[[File:QuantumCoffee2026a.jpg\|500px\|link=]]
	[[File:QuantumCoffee2026b.jpg~~\|thumb~~\|500px\|link=]]		[[File:QuantumCoffee2026b.jpg\|500px\|link=]]

			A coffee shop in Pu'er city, Yunnan Province, China

Quantum Coffee

Mahnsoo.Choi — Wed, 05 Aug 2026 12:22:06 GMT

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Quantum Technology Workshop 2026

Mahnsoo.Choi — Wed, 05 Aug 2026 12:19:05 GMT

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	[[File:QuantumCoffee2026a.jpg\|150px\|left\|thumb\| Guess where? Not even a major city.]]		[[File:QuantumCoffee2026a.jpg\|150px\|left\|thumb\|link=Quantum Coffee\| Guess where? Not even a major city.]]
	“Everything is quantum, but nothing is fully quantum. Not yet.”		“Everything is quantum, but nothing is fully quantum. Not yet.”
	This was the challenge that Rolf Landauer and Markus Buttiker set out to solve by studying quantum transport in nanoscale systems. Since Richard Feynman's wild speculation and Peter Shor's stunning discovery, quantum computing and information are taking over this endeavor. Now, good or bad, even laypeople are getting involved, investing in quantum businesses like IonQ and IBM Q, and even incorporating quantum into their daily lives (as seen in the picture on the left).		This was the challenge that Rolf Landauer and Markus Buttiker set out to solve by studying quantum transport in nanoscale systems. Since Richard Feynman's wild speculation and Peter Shor's stunning discovery, quantum computing and information are taking over this endeavor. Now, good or bad, even laypeople are getting involved, investing in quantum businesses like IonQ and IBM Q, and even incorporating quantum into their daily lives (as seen in the picture on the left).

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Tang, Gaoming

Mahnsoo.Choi — Wed, 05 Aug 2026 07:11:08 GMT

=Transverse thermophotovoltaics

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	Gaomin Tang earned his Ph.D. in physics at the University of Hong Kong in 2026 under the supervision of Prof. Jian Wang. He then continued as a postdoctoral researcher in Hong Kong with Prof. Jian Wang for one and half years. In 2018, He joined Prof. Jian-Sheng Wang’s group at National University of Singapore, where he began working on near-field thermal radiation. He subsequently worked with Prof. Christoph Bruder at the University of Basel from 2019 to 2022 on quantum transport in superconducting junctions. Following that, he spent six months as a visiting scholar in Prof. C. T. Chan’s group at the Hong Kong University of Science and Technology. At the end of 2022, he joined the Graduate School of the China Academy of Engineering Physics through the Overseas Young Talent Program, where he established his research group.		Gaomin Tang earned his Ph.D. in physics at the University of Hong Kong in 2026 under the supervision of Prof. Jian Wang. He then continued as a postdoctoral researcher in Hong Kong with Prof. Jian Wang for one and half years. In 2018, He joined Prof. Jian-Sheng Wang’s group at National University of Singapore, where he began working on near-field thermal radiation. He subsequently worked with Prof. Christoph Bruder at the University of Basel from 2019 to 2022 on quantum transport in superconducting junctions. Following that, he spent six months as a visiting scholar in Prof. C. T. Chan’s group at the Hong Kong University of Science and Technology. At the end of 2022, he joined the Graduate School of the China Academy of Engineering Physics through the Overseas Young Talent Program, where he established his research group.

	==Transverse thermophotovoltaics=		==Transverse thermophotovoltaics==

	Transverse thermophotovoltaics has been conceptually proposed as a paradigm distinct from conventional junction-based photovoltaics. The talk will introduce a microscopic formalism of this effect in which a transverse electric current emerges in a two dimensional metal sheet via nonreciprocal surface plasmon polaritons driven by near-field thermal radiation. This theoretical formalism incorporates the electron-photon interaction by integrating electronic transition factor governed by energy-momentum conservation, the photon flux factor encoding the nonreciprocal surface modes, and their directional coupling. Transverse thermophotovoltaics opens new avenues for active nanoscale thermal energy conversion. Furthermore, I will extend this framework to the photonic spin Seebeck effect in a similar setup, demonstrating how Rashba spin-orbit coupling in an electron-doped transition metal dichalcogenide monolayer converts circularly polarized thermal photons into electronic spin to induce a spin current.		Transverse thermophotovoltaics has been conceptually proposed as a paradigm distinct from conventional junction-based photovoltaics. The talk will introduce a microscopic formalism of this effect in which a transverse electric current emerges in a two dimensional metal sheet via nonreciprocal surface plasmon polaritons driven by near-field thermal radiation. This theoretical formalism incorporates the electron-photon interaction by integrating electronic transition factor governed by energy-momentum conservation, the photon flux factor encoding the nonreciprocal surface modes, and their directional coupling. Transverse thermophotovoltaics opens new avenues for active nanoscale thermal energy conversion. Furthermore, I will extend this framework to the photonic spin Seebeck effect in a similar setup, demonstrating how Rashba spin-orbit coupling in an electron-doped transition metal dichalcogenide monolayer converts circularly polarized thermal photons into electronic spin to induce a spin current.

Tang, Gaoming

Mahnsoo.Choi — Wed, 05 Aug 2026 07:07:15 GMT

Created page with "Gaomin Tang earned his Ph.D. in physics at the University of Hong Kong in 2026 under the supervision of Prof. Jian Wang. He then continued as a postdoctoral researcher in Hong Kong with Prof. Jian Wang for one and half years. In 2018, He joined Prof. Jian-Sheng Wang’s group at National University of Singapore, where he began working on near-field thermal radiation. He subsequently worked with Prof. Christoph Bruder at the University of Basel from 2019 to 2022 on quantu..."

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Gaomin Tang earned his Ph.D. in physics at the University of Hong Kong in 2026 under the supervision of Prof. Jian Wang. He then continued as a postdoctoral researcher in Hong Kong with Prof. Jian Wang for one and half years. In 2018, He joined Prof. Jian-Sheng Wang’s group at National University of Singapore, where he began working on near-field thermal radiation. He subsequently worked with Prof. Christoph Bruder at the University of Basel from 2019 to 2022 on quantum transport in superconducting junctions. Following that, he spent six months as a visiting scholar in Prof. C. T. Chan’s group at the Hong Kong University of Science and Technology. At the end of 2022, he joined the Graduate School of the China Academy of Engineering Physics through the Overseas Young Talent Program, where he established his research group.

==Transverse thermophotovoltaics=

Transverse thermophotovoltaics has been conceptually proposed as a paradigm distinct from conventional junction-based photovoltaics. The talk will introduce a microscopic formalism of this effect in which a transverse electric current emerges in a two dimensional metal sheet via nonreciprocal surface plasmon polaritons driven by near-field thermal radiation. This theoretical formalism incorporates the electron-photon interaction by integrating electronic transition factor governed by energy-momentum conservation, the photon flux factor encoding the nonreciprocal surface modes, and their directional coupling. Transverse thermophotovoltaics opens new avenues for active nanoscale thermal energy conversion. Furthermore, I will extend this framework to the photonic spin Seebeck effect in a similar setup, demonstrating how Rashba spin-orbit coupling in an electron-doped transition metal dichalcogenide monolayer converts circularly polarized thermal photons into electronic spin to induce a spin current.

[[Category: Speakers]]
[[Category: Quantum Technology Workshop 2026]]

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