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arXiv:2110.02837 · Physical Review A

Dissipation-assisted preparation of steady spin-squeezed states of SiV centers

Jia‐Qiang Chen, Yi‐Fan Qiao, Xing‐Liang Dong, Xin‐Lei Hei, Fuli Li

Published Jan 7, 2021• 20 citations
arXivHTMLPDF

Abstract

We propose an efficient scheme for generating spin-squeezed states at steady state in a spin-mechanical hybrid system, where an ensemble of SiV centers is coupled to a strongly damped nanomechanical resonator. We show that there exists a collective steady state in the system, which is exactly formed by the collective spin states plus the zero excitation state of the mechanical mode. The generation of the steady spin-squeezed state is based on a dissipative quantum dynamical process in which the mechanical dissipation plays a positive role but without destroying the target state. We demonstrate that the spin-squeezed steady state can be deterministically prepared via dissipative means, with the optimal spin squeezing up to $4/N$ in the ideal case, where $N$ is the number of spins. This work provides a promising platform for quantum information processing and quantum metrology.

DOI
10.1103/physreva.103.013709

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We present and analyze a new approach for the generation of atomic spin-squeezed states. Our method involves the collective coupling of an atomic ensemble to a decaying mode of an open optical cavity. We demonstrate the existence of a collective atomic dark state, decoupled from the radiation field. By explicitly constructing this state we find that it can feature spin squeezing bounded only by the Heisenberg limit. We show that such dark states can be deterministically prepared via dissipative means, thus turning dissipation into a resource for entanglement. The scaling of the phase sensitivity taking realistic imperfections into account is discussed.
Abstract An experimentally feasible scheme for preparing the squeezed spin states in a novel spin–mechanical hybrid system is studied. The setup under consideration is realized by a single‐crystal diamond waveguide with negatively charged silicon‐vacancy (SiV) centers embedded. After studying the strain couplings between the SiV spins and the propagating phonon modes, analyses show that long‐range spin–spin interactions can be achieved under large detuning condition. Modeled as an effective one‐axis twisting Hamiltonian, these nonlinear spin–spin couplings can steer the system to the squeezed spin states in the practical situations. This proposal may have interesting applications in high‐precision metrology and quantum information processing.
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A hybrid device consisting of a nitrogen-vacancy-center ensemble (((NVE))) in diamond magnetically coupled to a superconducting flux qubit is investigated. The flux qubit is suitably driven by a bichromatic microwave field to induce sidebands, which leads to the desired qubit-NVE coupling. The distinct feature of the present scheme is that the qubit decay as a resource is utilized to steer the stationary state of the NVE into a single-mode squeezed vacuum state via a dissipative repumping process.
Abstract Spin squeezing, a form of many-body entanglement, is a crucial resource in quantum metrology and information processing. While experimentally viable protocols for generating stable spin squeezing have been proposed in quantum optics setups, there is growing interest in quantum hybrid solid-state systems as alternative platforms for both engineering and exploring many-body quantum phenomena. In this work, we propose a scheme to generate long-lived spin squeezing in an ensemble of solid-state qubits interacting with electromagnetic noise emitted by a squeezed solid-state bath. We identify the conditions under which quantum correlations within the bath can be transferred to the qubit array, driving it into an entangled state independently of its initial configuration. To assess the experimental feasibility of our approach, we analyze the dynamics of an array of solid-state spin defects coupled to a common ferromagnetic bath, which is driven into a non-equilibrium squeezed state through its interaction with a surface acoustic wave mode. Our results demonstrate that the ensemble can exhibit steady-state spin squeezing under suitable conditions, opening new pathways for the generation of robust many-body entanglement in solid-state spin ensembles.