Bell-state generation for spin qubits via dissipative coupling

• URL: http://arxiv.org/abs/2108.07365v2
• Date: Thu, 24 Nov 2022 12:09:24 GMT
• Title: Bell-state generation for spin qubits via dissipative coupling
• Authors: Ji Zou and Shu Zhang and Yaroslav Tserkovnyak
• Abstract summary: We investigate the dynamics of two spin qubits interacting with a magnetic medium. We show how a sizable long-lived entanglement can be established via the magnetic environment. Our study may find applications in quantum information science, quantum spintronics, and for sensing of nonlocal quantum correlations.
• Score: 3.011018394325566
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We theoretically investigate the dynamics of two spin qubits interacting with a magnetic medium. A systematic formal framework for this qubit-magnet hybrid system is developed in terms of the steady-state properties of the magnetic medium. Focusing on the induced dissipative coupling between the spin qubits, we show how a sizable long-lived entanglement can be established via the magnetic environment, in the absence of any coherent coupling. Moreover, we demonstrate that maximally-entangled two-qubit states (Bell states) can be achieved in this scheme when complemented by proper postselection. In this situation, the time evolution of the entanglement is governed by a non-Hermitian Hamiltonian, where dynamical phases are separated by an exceptional point. The resultant Bell state is robust against weak random perturbations and does not require the preparation of a particular initial state. Our study may find applications in quantum information science, quantum spintronics, and for sensing of nonlocal quantum correlations.

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