A5080244707- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Quantum Computing Algorithms and Architecture
- Quantum Mechanics and Applications
- Advanced Frequency and Time Standards
- Spectroscopy and Quantum Chemical Studies
- Neural Networks and Reservoir Computing
- Quantum many-body systems
- Advanced Thermodynamics and Statistical Mechanics
Collaborative Innovation Center of Quantum Matter
2021-2023
Peking University
2021-2023
Shanxi University
2021
We present an experimentally practical method to reveal Einstein-Podolsky-Rosen (EPR) steering in non-Gaussian spin states by exploiting a connection quantum metrology. Our criterion is based on the Fisher information, and uses bounds derived from generalized spin-squeezing parameters that involve measurements of higher-order moments. This leads us introduce concept conditional parameters, which quantify metrological advantage provided states, as well detect presence EPR paradox.
We discuss the realization of a universal set ultrafast single- and two-qubit operations with superconducting quantum circuits investigate most relevant physical technical limitations that arise when pushing for faster gates. With help numerical optimization techniques, we establish fundamental bound on minimal gate time, which is determined independently qubit design solely by its nonlinearity. In addition, important practical restrictions from finite transition frequency limited bandwidth...
Abstract Continuous U(1) gauge symmetry, which guarantees the conservation of total excitations in linear bosonic systems, will be broken when it comes to strong-coupling regime where rotation wave approximation (RWA) fails. Here we develop analytic solutions for multi-mode systems with XX-type couplings beyond RWA, and propose a novel scheme implement high-fidelity quantum state transfer (QST) entanglement preparation (EP) high speed. The can realized designated coupling strength pulse...
We present an experimentally practical method to reveal Einstein-Podolsky-Rosen steering in non-Gaussian spin states by exploiting a connection quantum metrology. Our criterion is based on the Fisher information, and uses bounds derived from generalized spin-squeezing parameters that involve measurements of higher-order moments. This leads us introduce concept conditional parameters, which quantify metrological advantage provided states, as well detect presence EPR paradox.
Interacting quantum systems illustrate complex phenomena including phase transitions to novel ordered phases. The universal nature of critical reduces their description determining only the transition temperature and exponents. Numerically calculating these results for in new universality classes is complicated due slowing down, requiring increasing resources near point. An alternative approach analytically continues calculation onto plane determines partition function via its zeros. Here we...
Continuous U(1) gauge symmetry, which guarantees the conservation of total excitations in linear bosonic systems, will be broken when it comes to strong-coupling regime where rotation wave approximation (RWA) fails. Here we develop analytic solutions for multi-mode systems with XX-type couplings beyond RWA, and proposed a novel scheme implement high-fidelity quantum state transfer (QST) entanglement preparation (EP) high speed. The can realized designated coupling strength pulse duration...