Chunlei Qu

Entanglement freezing and thawing in one-dimensional optical lattice systems

Xiao‐Feng Qian, Chunlei Qu, Joseph Eberly

We investigate the dynamics of different configurations of entanglement in a one-dimensional N -site optical lattice chain. Entanglement freezing has so far been primarily associated with noisy or decoherence-induced processes. Remarkably, we show that this phenomenon also occurs in a fully coherent …

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Single-Ensemble Multiparameter Squeezing with Qudits

Xiaoshui Lin, Chunlei Qu, Chong Zu, Chuanwei Zhang

Quantum-enhanced multiparameter sensing is often associated with distributed architectures or 2-anticoherent states, whereas squeezing in a single collective ensemble is typically limited to single-parameter metrology. Here, we show that a single ensemble can support simultaneous multiparameter squeezing when each sensor is promoted …

Single-Ensemble Multiparameter Squeezing with Qudits

Xiaoshui Lin, Chunlei Qu, Chong Zu, Chuanwei Zhang

Quantum-enhanced multiparameter sensing is often associated with distributed architectures or 2-anticoherent states, whereas squeezing in a single collective ensemble is typically limited to single-parameter metrology. Here, we show that a single ensemble can support simultaneous multiparameter squeezing when each sensor is promoted …

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Optical Hopfield neural networks with enhanced storage capacity

Zhaotong Li, Michael Katidis, Khalid Hamid Musa, Yu‐Ping Huang et autres

Hopfield neural networks, classic examples of associative memories, are well-established models for pattern storage and retrieval. However, the original Hopfield network, characterized by quadratic interactions among neurons, exhibits limited storage capacity. To enhance this capacity, researchers have introduced nonlinear functions—such as polynomial …

Optical Hopfield neural networks with enhanced storage capacity

Zhaotong Li, Michael Katidis, Khalid Hamid Musa, Yu‐Ping Huang et autres

Hopfield neural networks, classic examples of associative memories, are well-established models for pattern storage and retrieval. However, the original Hopfield network, characterized by quadratic interactions among neurons, exhibits limited storage capacity. To enhance this capacity, researchers have introduced nonlinear functions—such as polynomial …

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Magnetic soliton molecules in binary condensates

R. M. V. Röhrs, Chunlei Qu, R. N. Bisset

Two-component Bose-Einstein condensates in the miscible phase can support polarization solitary waves, known as magnetic solitons. By calculating the interaction potential between two magnetic solitons, we elucidate the mechanisms and conditions for the formation of bound states—or —and support these predictions with …

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Parametric excitations in a harmonically trapped binary Bose-Einstein condensate

Meiling Wang, Juan Wang, Yan Li, F. Dalfovo et autres

We investigate parametric excitation and pattern formation in a harmonically trapped two-component Bose-Einstein condensate. We assume the condensate to be in the miscible phase, but near the miscible-immiscible phase transition, where total-density and spin-density excitations are decoupled. By periodically modulating the atomic …

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Bose-Einstein condensates in a spin-twisted harmonic trap

Huaxin He, Fengtao Pang, Xianchao Zhang, Yongping Zhang et autres

We investigate the ground-state phases and spin-scissors dynamics of binary Bose-Einstein condensates confined in a twisted two-dimensional harmonic trap. The ground state hosts three distinct phases-phase-separated, polarized, and phase-mixed-determined by the Rabi coupling, interaction ratio G (between inter-component and intra-component interactions), and …

Bose-Einstein condensates in a synthetic magnetic field with tunable orientation

Fengtao Pang, Huaxin He, Yongping Zhang, Chunlei Qu

We systematically investigate the ground state and dynamics of spinor Bose-Einstein condensates subject to a position-dependent detuning. This detuning induces three related quantities (a synthetic magnetic field, an angular velocity, and an angular momentum), which, due to trap anisotropy, may point in …

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Bose-Einstein Condensates in a Synthetic Magnetic Field with Tunable Orientation

Fengtao Pang, Huaxin He, Yongping Zhang, Chunlei Qu

We systematically investigate the ground state and dynamics of spinor Bose-Einstein condensates subject to a position-dependent detuning. This detuning induces three related quantities-a synthetic magnetic field, an angular velocity, and an angular momentum-which, due to trap anisotropy, may point in different directions. …

Parametric excitations in a harmonically trapped binary Bose-Einstein condensate

Meiling Wang, Juan Wang, Yan Li, F. Dalfovo et autres

We investigate parametric excitation and pattern formation in a harmonically trapped two-component Bose-Einstein condensate. We assume the condensate to be in the miscible phase, but near the miscible-immiscible phase transition, where total density and spin density excitations are decoupled. By periodically modulating …

Collective oscillations of Bose-Einstein condensates in a synthetic magnetic field

Huaxin He, Fengtao Pang, Yongping Zhang, Chunlei Qu

We study the collective oscillations of spin-orbit-coupled Bose-Einstein condensates in the presence of position-dependent detuning. Specifically, we explore the quadrupole modes of the system using both numerical and analytical approaches based on the Gross-Pitaevskii equation and hydrodynamic theory. Due to spin-orbit coupling …

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