Publications (40)
Deterministic generation of bright multicolor entanglement from optomechanical systems
Keyu Xia
Entangled continuous variable (CV) Gaussian states with different wavelengths plays a central role in recent CV-based approaches to quantum network, quantum information processing…
Squeezing giant spin states via geometric phase control in cavity-assisted Raman transitions
Keyu Xia
Squeezing ensemble of spins provides a way to surpass the standard quantum limit (SQL) in quantum metrology and test the fundamental physics as well, and therefore attracts broad i…
Quantum squeezing induced nonreciprocal phonon laser
Tian-Xiang Lu, Yan Wang, Keyu Xia +3
Phonon lasers or coherent amplifications of mechanical oscillations have provided powerful tools for both fundamental studies of coherent acoustics and diverse applications ranging…
Tunable slowing, storing and releasing of a weak microwave field
Keyu Xia
We study the slowing, storing and releasing of microwave pulses in a superconducting circuits composed of two coplanar waveguide resonators and a superconducting transmon-type qubi…
Generation of True Quantum Random Numbers with On-Demand Probability Distributions via Single-Photon Quantum Walks
Chaoying Meng, Miao Cai, Yufang Yang +7
Random numbers are at the heart of diverse fields, ranging from simulations of stochastic processes to classical and quantum cryptography. The requirement for true randomness in th…
Single-photon transport in a whispering-gallery mode microresonator directionally coupled with a two-level quantum emitter
Jiangshan Tang, Lei Tang, Keyu Xia
We investigate the single-photon transport problem in the system of a Whispering-Gallery mode microresonator directionally coupled with a two-level quantum emitter (QE). This QE-mi…
Reversible optical isolators and quasi-circulators using a magneto-optical Fabry-Pérot cavity
Tiantian Zhang, Wenpeng Zhou, Zhixiang Li +7
Nonreciprocal optical devices are essential for laser protection, modern optical communication and quantum information processing by enforcing one-way light propagation. The conven…
Solid state optical interconnect between distant superconducting quantum chips
Keyu Xia, Jason Twamley
We propose a design for a quantum interface exploiting the electron spins in crystals to swap the quantum states between the optical and microwave. Using sideband driving of a supe…
A table-top high-sensitivity gyroscope based on slow light and cavity enhanced photon drag
Min She, Jiangshan Tang, Keyu Xia
A high-sensitivity gyroscope is vital for both investigation of the fundamental physics and monitor of the subtle variation of Earth's behaviors. However, it is challenge to realiz…
Quantum Cross Nonlinearity for Photon-Number-Resolving Nondestructive Detection
Jiang-Shan Tang, Mingyuan Chen, Miao Cai +4
We present an unconventional mechanism for quantum nonlinearity in a system comprising of a V-type quantum emitter (QE) and two Fabry-Perot cavities. The two transitions of the V-t…
Towards On-Demand Heralded Single-Photon Sources via Photon Blockade
Jiangshan Tang, Lei Tang, Haodong Wu +7
Spontaneous parametric down-conversion (SPDC) in a laser pumped optical nonlinear medium can produce heralded single photons with a high purity but a very low yield. Improving the…
An opto-magneto-mechanical quantum interface between distant superconducting qubits
Keyu Xia, Michael R. Vanner, Jason Twamley
A quantum internet, where widely separated quantum devices are coherently connected, is a fundamental vision for local and global quantum information networks and processing. Super…
Generating spin squeezing states and Greenberger-Horne-Zeilinger entanglement using a hybrid phonon-spin ensemble in diamond
Keyu Xia, Jason Twamley
Quantum squeezing and entanglement of spins can be used to improve the sensitivity in quantum metrology. Here we propose a scheme to create collective coupling of an ensemble of sp…
Photonic indistinguishability characterization and optimization for cavity-based single-photon source
Miao Cai, Mingyuan Chen, Jiangshan Tang +1
Indistinguishability of single photons from independent sources is critically important for scalable quantum technologies. We provide a comprehensive comparison of single-photon in…
Plasmonic nano-resonator enhanced one-photon luminescence from single gold nanorods
Keyu Xia, Yingbo He, Hongming Shen +3
Strong Stokes and anti-Stokes one-photon luminescence from single gold nanorods is measured in experiments. It is found that the intensity and polarization of the Stokes and anti-S…
Non-Hermitian sensing from the perspective of post-selected measurements
Neng Zeng, Tao Liu, Keyu Xia +2
By employing the Naimark dilation, we establish a fundamental connection between non-Hermitian quantum sensing and post-selected measurements. The sensitivity of non-Hermitian quan…
Nonreciprocal spontaneous parametric process
Changbiao Li, Jiaqi Yuan, Ruidong He +5
Mediated by the interaction with quantum vacuum fields, a laser field propagating in a nonlinear optical medium can generate new light fields via spontaneous parametric process. Su…
On-Chip Chiral Single-Photon Interface: Isolation and Unidirectional Emission
Lei Tang, Jiangshan Tang, Weidong Zhang +5
Chiral quantum systems have received intensive attention in fundamental physics and applications in quantum information processing including optical isolation and photon unidirecti…
Exceptional-point-like Sensing near Hermitian Critical Points
Jiang-Shan Tang, Long-Qi Xiao, Hao-Dong Wu +6
A non-Hermitian system at an exceptional point (EP), a specific critical point (CP) associated with the parity-time symmetric phase transition, exhibits a sublinear response to per…
Giant enhancement of tunable optomechanical coupling via ultrarefractive medium
Keyu Xia, Jason Twamley
Exploring the fundamental quantum behaviour of optomechanical resonators is of great interest recently but requires the realization of the strong coupling regime. We study the opti…
Phase-controlled Fano resonance by the nanoscale optomechanics
Jian-Qi Zhang, Yi Xu, Keyu Xia +4
Observation of the Fano line shapes is essential to understand properties of the Fano resonance in different physical systems. We explore a tunable Fano resonance by tuning the pha…
Nonreciprocal single-photon band structure
Jiangshan Tang, Wei Nie, Lei Tang +5
We study single-photon band structure in a one-dimensional (1D) coupled-resonator optical waveguide (CROW) which chirally couples to an array of two-level quantum emitters (QEs). T…
High-Dimensional Two-Photon Quantum Controlled Phase-Flip Gate
Mingyuan Chen, Jiangshan Tang, Miao Cai +2
High-dimensional quantum systems have been used to reveal interesting fundamental physics and to improve information capacity and noise resilience in quantum information processing…
Detection of a weak magnetic field via cavity enhanced Faraday rotation
Keyu Xia, Nan Zhao, Jason Twamley
We study the sensitive detection of a weak static magnetic field via Faraday rotation induced by an ensemble of spins in a bimodal degenerate microwave cavity. We determine the lim…
Ultrabroadband nonreciprocal transverse energy flow of light in linear passive photonic circuits
Keyu Xia, M. Alamri, M. Suhail Zubairy
Using a technique, analogous to coherent population trapping in an atomic system, we propose schemes to create transverse light propagation violating left-right symmetry in a photo…
Prolonged Phase Segregation of Mixed-Halide Perovskite Nanocrystals in the Dark
Xueying Ma, Yuhui Ye, Yang Xiao +6
A critical issue hindering the potential applications of semiconductor mixed-halide perovskites is the phase segregation effect, wherein localized regions enriched with one type of…
Sample-half-inserted quantum interferometer
Wei Li, Tao Xie, Yu-Hang Luo +11
Quantum technologies have been widely recognized as unprecedented opportunities for ultra-high precision metrology. As a celebrated example in modern quantum optics, the Hong-Ou-Ma…
Pathway interference in a loop array of three coupled microresonators
Sandra Isabelle Schmid, Keyu Xia, Jörg Evers
A system of three coupled toroidal microresonators arranged in a loop configuration is studied. This setup allows light entering the resonator setup from a tapered fiber to evolve…
Dynamic Nonreciprocity with a Kerr Nonlinear Resonator
Rui-Kai Pan, Lei Tang, Keyu Xia +1
On-chip optical nonreciprocal devices are vital components for integrated photonic systems and scalable quantum information processing. Nonlinear optical isolators and circulators…
Nonlinear dissipation induced photon blockade
Xin Su, Jiang-Shan Tang, Keyu Xia
We theoretically propose a scheme for photon blockade in a cavity quantum electrodynamical system consisting of an N-type atomic medium interacting with a single-mode Fabry-Perot c…
Cavity-free nondestructive detection of a single optical photon
Keyu Xia, Mattias Johnsson, Peter L. Knight +1
Detecting a single photon without absorbing it is a long standing challenge in quantum optics. All experiments demonstrating the nondestructive detection of a photon make use of a…
Deterministic generation of an on-demand Fock state
Keyu Xia, Gavin K. Brennen, Demosthenes Ellinas +1
We theoretically study the deterministic generation of photon Fock states on-demand using a protocol based on a Jaynes Cummings quantum random walk which includes damping. We then…
A passive bias-free ultrabroadband optical isolator based on unidirectional self-induced transparency
Haodong Wu, Jiangshan Tang, Mingyuan Chen +4
Achieving a broadband nonreciprocal device without gain and any external bias is very challenging and highly desirable for modern photonic technologies and quantum networks. Here,…
Quantum memory and gates using a Lambda-type quantum emitter coupled to a chiral waveguide
Tao Li, Adam Miranowicz, Xuedong Hu +2
By coupling a -type quantum emitter to a chiral waveguide, in which the polarization of a photon is locked to its propagation direction, we propose a controllable photon-emitte…
Resource-efficient analyzer of Bell and Greenberger-Horne-Zeilinger states of multiphoton systems
Tao Li, Adam Miranowicz, Keyu Xia +1
We propose a resource-efficient error-rejecting entangled-state analyzer for polarization-encoded multiphoton systems. Our analyzer is based on two single-photon quantum-nondemolit…
Hybrid quantum gate and entanglement between a "stationary" photonic qubit and a flying optical state via a giant cross Kerr nonlinear effect
Keyu Xia, Jason Twamley
Quantum information processing with hybrid protocols making use of discrete- and continuous-variable currently attracts of great interest because of its promising applications in s…
Quantum Squeezing Induced Optical Nonreciprocity
Lei Tang, Jiangshan Tang, Mingyuan Chen +3
We propose an all-optical approach to achieve optical nonreciprocity on a chip by quantum squeezing one of two coupled resonator modes. By parametric pumping a nonlinear resonator…
Chaotic synchronization of two optical cavity modes in optomechanical systems
Nan Yang, Adam Miranowicz, Yong-Chun Liu +2
The synchronization of the motion of microresonators has attracted considerable attention. Here we present theoretical methods to synchronize the chaotic motion of two optical cavi…
Quantum routing of single optical photons with a superconducting flux qubit
Keyu Xia, Fedor Jelezko, Jason Twamley
Controlling and swapping quantum information in a quantum coherent way between the microwave and optical regimes is essential for building long-range superconducting quantum networ…
Nonreciprocal PT-symmetric phase transition in a non-Hermitian chiral quantum optical system
Miao Cai, Jiang-Shan Tang, Ming-Yuan Chen +1
Phase transitions, non-Hermiticity and nonreciprocity play central roles in fundamental physics. However, the triple interplay of these three fields is of lack in the quantum domai…