Experimental demonstration of a digital quantum simulation of a general PT-symmetric system

Wen, Jingwei1,2; Zheng, Chao3; Kong, Xiangyu1,2; Wei, Shijie4; Xin, Tao5,6,7; Long, Guilu1,2,8,9

2019-06-28

10.1103/PhysRevA.99.062122

PHYSICAL REVIEW A   影响因子和分区

2469-9926

2469-9934

PT-symmetric systems are one of the most interesting research fields in modern quantum physics, where various theoretical and experimental progress has been made. In our work, we experimentally demonstrate how to realize a general PT-symmetric two-level operation in a quantum computation frame with a universal circuit model. It is based on enlarging the system with ancillary qubits and encoding the subsystem with the non-Hermitian Hamiltonian with postselection. Furthermore, we use the general formula to demonstrate one particular interesting issue, entanglement restoration induced by local PT-symmetric operation in our four-qubit liquid nuclear magnetic resonance platform, and a theoretical explanation for the physical characteristics has been proposed. We also extend the protocol to the realization of an arbitrary two-level Hamiltonian evolution without a Hermitian restriction by an appropriate modification of the original quantum circuit. Our work lays the foundation for quantum simulation of the general PT-symmetric problem in realistic quantum simulators, and the scheme can be extended to other quantum computation platforms.

SCI ; EI

英语

通讯

Guangdong Innovative and Entrepreneurial Research Team Program[2016ZT06D348]

Optics ; Physics

Optics ; Physics, Atomic, Molecular & Chemical

WOS:000473133600002

AMER PHYSICAL SOC

20192707134291

Quantum chemistry ; Quantum entanglement ; Quantum optics ; Qubits ; Simulation platform

Physical Chemistry:801.4 ; Quantum Theory; Quantum Mechanics:931.4

PHYSICS

Web of Science

1.Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
2.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
3.North China Univ Technol, Coll Sci, Dept Phys, Beijing 100144, Peoples R China
4.IBM Res, Beijing 100094, Peoples R China
5.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
6.Peng Cheng Lab, Ctr Quantum Comp, Shenzhen 518055, Peoples R China
7.Southern Univ Sci & Technol, Shenzhen Key Lab Quantum Sci & Engn, Shenzhen 518055, Peoples R China
8.Tsinghua Natl Lab Informat Sci & Technol, Beijing 100084, Peoples R China
9.Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China

Wen, Jingwei,Zheng, Chao,Kong, Xiangyu,et al. Experimental demonstration of a digital quantum simulation of a general PT-symmetric system[J]. PHYSICAL REVIEW A,2019,99(6).

Wen, Jingwei,Zheng, Chao,Kong, Xiangyu,Wei, Shijie,Xin, Tao,&Long, Guilu.(2019).Experimental demonstration of a digital quantum simulation of a general PT-symmetric system.PHYSICAL REVIEW A,99(6).

Wen, Jingwei,et al."Experimental demonstration of a digital quantum simulation of a general PT-symmetric system".PHYSICAL REVIEW A 99.6(2019).