171 citations · 653 across the 20 of their papers we have counts for
20 papers
Observation of multiple steady states with engineered dissipation
Li Li, Tong Liu, Xue-Yi Guo +8
Simulating the dynamics of open quantum systems is essential in achieving practical quantum computation and understanding novel nonequilibrium behaviors. However, quantum simulatio…
Zeno Regime of Collective Emission: Non-Markovianity beyond Retardation
Yu-Xiang Zhang
To build up a collective emission, the atoms in an ensemble must coordinate their behavior by exchanging virtual photons. We study this non-Markovian process in a subwavelength ato…
Photonic Bound States and Scattering Resonances in Waveguide QED
Bastian Bakkensen, Yu-Xiang Zhang, Johannes Bjerlin +1
We study the emergence of two types of two-photon bounds states in waveguides of any chirality. Specifically, we present a systematic way of analytically determining the eigenstate…
Free-Fermion Multiply Excited Eigenstates and Their Experimental Signatures in 1D Arrays of Two-Level Atoms
Yu-Xiang Zhang, Klaus Mølmer
One-dimensional (1D) subwavelength atom arrays display multiply excited subradiant eigenstates which are reminiscent of free fermions. So far, these states have been associated wit…
Charge-Noise Insensitive Chiral Photonic Interface for Waveguide Circuit QED
Yu-Xiang Zhang, Carles R. i Carceller, Morten Kjaergaard +1
A chiral photonic interface is a quantum system that has different probabilities for emitting photons to the left and right. An on-chip compatible chiral interface is attractive fo…
Subradiant emission from regular atomic arrays: universal scaling of decay rates from the generalized Bloch theorem
Yu-Xiang Zhang, Klaus Mølmer
The Hermitian part of the dipole-dipole interaction in infinite periodic arrays of two-level atoms yields an energy band of singly excited states. In this Letter, we show that a di…
Magnon Accumulation in Chirally Coupled Magnets
Tao Yu, Yu-Xiang Zhang, Sanchar Sharma +2
We report strong chiral coupling between magnons and photons in microwave waveguides that contain chains of small magnets on special lines. Large magnon accumulations at one edge o…
Subradiant Dimer Excitations of Emitter Chains Coupled to a 1D Waveguide
Yu-Xiang Zhang, Chuan Yu, Klaus Mølmer
This Letter shows that chains of optical or microwave emitters coupled to a 1D waveguide support subradiant states with close pairs of excited emitters, which have longer lifetimes…
Theory of Subradiant States of a One-Dimensional Two-Level Atom Chain
Yu-Xiang Zhang, Klaus Mølmer
Recently, the subradiant states of one-dimensional two-level atom chains coupled to light modes were found to have decay rates obeying a universal scaling, and an unexpected fermio…
Surface plasmon launching by polariton superradiance
Yu-Xiang Zhang, Yuan Zhang, Klaus Mølmer
The condition of phase matching prohibits the transfer of excitation from free-space photons to surface plasmon polaritons (SPP). We propose and analyze a scheme that excites an en…
Monte-Carlo Simulations of Superradiant Lasing
Yuan Zhang, Yu-Xiang Zhang, Klaus Mølmer
We present simulations of the superradiant dynamics of ensembles of atoms in the presence of collective and individual atomic decay processes. We unravel the density matrix with Mo…
Dicke Phase Transition in a Disordered Emitter-Graphene Plasmon System
Yu-Xiang Zhang, Yuan Zhang, Klaus Mølmer
We study the Dicke phase transition in a disordered system of emitters coupled to the plasmonic modes of a graphene monolayer. This system has unique properties associated with the…
Direct state reconstruction with coupling-deformed pointer observables
Xuanmin Zhu, Yu-Xiang Zhang, Shengjun Wu
Direct state tomography (DST) using weak measurements has received wide attention. Based on the concept of coupling-deformed pointer observables presented by Zhang \emph{et al}.[Ph…
Ground-state cooling of dispersively coupled optomechanical system in unresolved sideband regime via dissipatively coupled oscillator
Yu-Xiang Zhang, Shengjun Wu, Zeng-Bing Chen +1
In the optomechanical cooling of a dispersively coupled oscillator, it is only possible to reach the oscillator ground state in the resolved sideband regime, where the cavity-mode…
The amplification of weak measurements under quantum noise
Xuanmin Zhu, Yu-Xiang Zhang
The influence of outside quantum noises on the amplification of weak measurements is investigated. Three typical quantum noises are discussed. The maximum values of the pointer's s…
Coupling-Deformed Pointer Observables and Weak Values
Yu-Xiang Zhang, Shengjun Wu, Zeng-Bing Chen
While the novel applications of weak values have recently attracted wide attention, weak measurement, the usual way to extract weak values, suffers from risky approximations and se…
Quantum Uncertainty and Error-Disturbance Tradeoff
Yu-Xiang Zhang, Shengjun Wu, Zeng-Bing Chen
The uncertainty principle is often interpreted by the tradeoff between the error of a measurement and the consequential disturbance to the followed ones, which originated long ago…
Direct and Parallel Tomography of a Quantum Process
Yu-Xiang Zhang, Shengjun Wu, Zeng-Bing Chen
As the method to completely characterize quantum dynamical processes, quantum process tomography (QPT) is vitally important for quantum information processing and quantum control,…
Information gain versus coupling strength in quantum measurements
Xuanmin Zhu, Yuxiang Zhang, Quanhui Liu +1
We investigate the relationship between the information gain and the interaction strength between the quantum system and the measuring device. A strategy is proposed to calculate t…
Quantum measurements with preselection and postselection
Xuanmin Zhu, Yuxiang Zhang, Shengshi Pang +3
We study quantum measurement with preselection and postselection, and derive the precise expressions of the measurement results without any restriction on the coupling strength bet…