95 citations · 206 across the 4 of their papers we have counts for
9 papers · 1 filter
Finite-system Multicriticality at the Superradiant Quantum Phase Transition
Han-Jie Zhu, Kai Xu, Guo-Feng Zhang +1
We demonstrate the existence of finite-system multicriticality in a qubit-boson model where biased qubits collectively coupled to a single-mode bosonic field. The interplay between…
Probing the dynamical phase transition with a superconducting quantum simulator
Kai Xu, Zheng-Hang Sun, Wuxin Liu +9
Non-equilibrium quantum many-body systems, which are difficult to study via classical computation, have attracted wide interest. Quantum simulation can provide insights into these…
Quantum dynamical speedup in correlated noisy channels
Kai Xu, Guo-Feng Zhang, Wu-Ming Liu
The maximal evolution speed of a quantum system can be represented by quantum speed limit time (QSLT).We investigate QSLT of a two-qubit system passing through a correlated channel…
Observation of multi-component atomic Schrödinger cat states of up to 20 qubits
Chao Song, Kai Xu, Hekang Li +13
We report on deterministic generation of 18-qubit genuinely entangled Greenberger-Horne-Zeilinger (GHZ) state and multi-component atomic Schrödinger cat states of up to 20 qubits o…
Deterministic entanglement swapping in a superconducting circuit
Wen Ning, Xin-Jie Huang, Pei-Rong Han +8
Entanglement swapping, the process to entangle two particles without coupling them in any way, is one of the most striking manifestations of the quantum-mechanical nonlocal charact…
Dynamical speedup of a two-level system induced by coupling in the hierarchical environment
Kai Xu, Guo-Feng Zhang, Wu-Ming Liu
We investigate the dynamics of a two-level system in the presence of an overall environment composed of two layers. The first layer is just one single-mode cavity which decays to m…