Spin manipulation and decoherence in a quantum dot mediated by a synthetic spin-orbit coupling of broken T-symmetry

Huang，Peihao1,2,3; Hu，Xuedong4

2022

10.1088/1367-2630/ac430c

NEW JOURNAL OF PHYSICS   影响因子和分区

1367-2630

The electrical control of a spin qubit in a quantum dot (QD) relies on spin-orbit coupling (SOC), which could be either intrinsic to the underlying crystal lattice or heterostructure, or extrinsic via, for example, a micro-magnet. In experiments, micromagnets have been used as a synthetic SOC to enable strong coupling of a spin qubit in quantum dots with electric fields. Here we study theoretically the spin relaxation, pure dephasing, spin manipulation, and spin-photon coupling of an electron in a QD due to the synthetic SOC induced spin-orbit mixing. We find qualitative difference in the spin dynamics in the presence of a synthetic SOC compared with the case of the intrinsic SOC. Specifically, spin relaxation due to the synthetic SOC and deformation potential phonon emission (or Johnson noise) shows (or B 0) dependence with the magnetic field, which is in contrast with the (or) dependence in the case of the intrinsic SOC. Moreover, charge noise induces fast spin dephasing to the first order of the synthetic SOC, which is in sharp contrast with the negligible spin pure dephasing in the case of the intrinsic SOC. These qualitative differences are attributed to the broken time-reversal symmetry (T-symmetry) of the synthetic SOC. An SOC with broken T-symmetry (such as the synthetic SOC from a micro-magnet) eliminates the 'Van Vleck cancellation' and causes a finite longitudinal spin-electric coupling that allows the longitudinal coupling between spin and electric field, and in turn allows spin pure dephasing. Finally, through proper choice of magnetic field orientation, the electric-dipole spin resonance via the synthetic SOC can be improved with potential applications in spin-based quantum computing.

electric-dipole spin resonance pure dephasing quantum dot spin qubit spin relaxation spin-orbit coupling spin-photon coupling

SCI ; EI

英语

第一 ; 通讯

WOS:000735634300001

20220511570803

Electric fields ; Magnetic fields ; Magnets ; Nanocrystals ; Photons ; Quantum optics ; Qubits ; Spin dynamics

Electricity: Basic Concepts and Phenomena:701.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Semiconductor Devices and Integrated Circuits:714.2 ; Light, Optics and Optical Devices:741 ; Light/Optics:741.1 ; Nanotechnology:761 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4 ; Crystalline Solids:933.1

PHYSICS

2-s2.0-85123749071

Scopus

1.Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.International Quantum Academy,Shenzhen,518048,China
3.Guangdong Provincial Key Laboratory of Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Department of Physics,University at Buffalo,Suny,Buffalo,14260,United States

Huang，Peihao,Hu，Xuedong. Spin manipulation and decoherence in a quantum dot mediated by a synthetic spin-orbit coupling of broken T-symmetry[J]. NEW JOURNAL OF PHYSICS,2022,24(1).

Huang，Peihao,&Hu，Xuedong.(2022).Spin manipulation and decoherence in a quantum dot mediated by a synthetic spin-orbit coupling of broken T-symmetry.NEW JOURNAL OF PHYSICS,24(1).

Huang，Peihao,et al."Spin manipulation and decoherence in a quantum dot mediated by a synthetic spin-orbit coupling of broken T-symmetry".NEW JOURNAL OF PHYSICS 24.1(2022).