144 citations · 281 across the 10 of their papers we have counts for
11 papers
Observing Bell Inequality Violation Beyond the Qubit Bound in a Spinor Bose--Einstein Condensate
Wenxin Xu, Junshuang Hu, Guillem Müller-Rigat +4
Correlations allowed by quantum mechanics can defy any classical explanation, with Bell nonlocality standing as their most profound and operationally powerful manifestation. While…
Detection of entangled states supported by reinforcement learning
Jia-Hao Cao, Feng Chen, Qi Liu +4
Discrimination of entangled states is an important element of quantum enhanced metrology. This typically requires low-noise detection technology. Such a challenge can be circumvent…
Realizing the entanglement Hamiltonian of a topological quantum Hall system
Quentin Redon, Qi Liu, Jean-Baptiste Bouhiron +4
Topological quantum many-body systems, such as Hall insulators, are characterized by a hidden order encoded in the entanglement between their constituents. Entanglement entropy, an…
Cyclic nonlinear interferometry with entangled non-Gaussian spin states
Qi Liu, Tian-Wei Mao, Ming Xue +2
We propose an efficient nonlinear readout scheme for entangled non-Gaussian spin states (ENGSs) based on the intrinsic quasi-cyclic dynamics of interacting spin-1/2 systems. We foc…
Quantum enhanced sensing by echoing spin-nematic squeezing in atomic Bose-Einstein condensate
Tian-Wei Mao, Qi Liu, Xin-Wei Li +6
Quantum entanglement can provide enhanced precision beyond standard quantum limit (SQL), the highest precision achievable with classical means. It remains challenging, however, to…
Nonlinear interferometry beyond classical limit facilitated by cyclic dynamics
Qi Liu, Ling-Na Wu, Jia-Hao Cao +5
Time-reversed evolution has substantial implications in physics, including prominent applications in refocusing of classical waves or spins and fundamental researches such as quant…
Universal relations between atomic dipolar relaxation and van der Waals interaction
Yuan-Gang Deng, Yi-Quan Zou, Gao-Ren Wang +4
Dipolar relaxation happens when one or both colliding atoms flip their spins exothermically inside a magnetic () field. This work reports precise measurements of dipolar relaxat…
Faster State Preparation across Quantum Phase Transition Assisted by Reinforcement Learning
Shuai-Feng Guo, Feng Chen, Qi Liu +6
An energy gap develops near quantum critical point of quantum phase transition in a finite many-body (MB) system, facilitating the ground state transformation by adiabatic paramete…
Multi-parameter estimation with multi-mode Ramsey interferometry
Xinwei Li, Jia-Hao Cao, Qi Liu +2
Estimating multiple parameters simultaneously is of great importance to measurement science and application. For a single parameter, atomic Ramsey interferometry (or equivalently o…
Beating the classical precision limit with spin-1 Dicke state of more than 10000 atoms
Yi-Quan Zou, Ling-Na Wu, Qi Liu +5
Interferometry is a paradigm for most precision measurements. Using uncorrelated particles, the achievable precision for a two-mode (two-path) interferometer is bounded by the…
Dynamical Gauge Effects and Holographic Scaling of Non-Equilibrium Motion in a Disordered and Dissipative Atomic Gas
Jianshi Zhao, Craig Price, Qi Liu +2
We present a table-top realization of a non-equilibrium quantum system described by a dynamical gauge field propagating on an effectively curved space and time manifold. The system…