Strong tunable spin-spin interaction in a weakly coupled nitrogen vacancy spin-cavity electromechanical system

Article

关键词: CIRCUIT QUANTUM ELECTRODYNAMICS;    COHERENCE TIME;    LIGHT;    STATE;    ENTANGLEMENT;    RESONATOR;    MICROWAVE;    NOISE;   

DOI  :  10.1103/PhysRevB.103.174106

来源: SCIE

【 摘 要 】

The long coherence time of a single nitrogen vacancy (NV) center spin in diamond is a crucial advantage for implementing quantum information processing. However, the realization of strong coupling between single NV spins is challenging. Here, we propose a method to greatly enhance the interaction between two single NV spins in diamond which are only weakly coupled to an electromechanical cavity. Owing to the presence of a critical point for the linearized electromechanical subsystem, the coupling between a single NV spin and the high-frequency polariton (formed by the mechanical and cavity modes) can be fully decoupled, but the coupling between the single NV spin and the low-frequency polariton is, however, greatly enhanced. Thus, AC Stark shift of the single NV spin can be measured. With the low-frequency polariton as a quantum bus, a strong coupling between two single NV centers is achievable. This effective strong coupling can ensure coherent quantum-information exchange between two spin qubits in the weakly coupled spin-cavity electromechanical system.

【 授权许可】

Free