Reservoir-engineered spin squeezing: macroscopic even-odd effects and hybrid-systems implementations

• URL: http://arxiv.org/abs/2104.10363v2
• Date: Sun, 6 Feb 2022 23:16:11 GMT
• Title: Reservoir-engineered spin squeezing: macroscopic even-odd effects and hybrid-systems implementations
• Authors: Peter Groszkowski, Martin Koppenh\"ofer, Hoi-Kwan Lau, A. A. Clerk
• Abstract summary: We revisit the dissipative approach to producing and stabilizing spin-squeezed states of an ensemble of $N$ two-level systems. We discuss two surprising yet generic features of such protocols.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: We revisit the dissipative approach to producing and stabilizing spin-squeezed states of an ensemble of $N$ two-level systems, providing a detailed analysis of two surprising yet generic features of such protocols. The first is a macroscopic sensitivity of the steady state to whether $N$ is even or odd. We discuss how this effect can be avoided (if the goal is parity-insensitive squeezing), or could be exploited as a new kind of sensing modality to detect the addition or removal of a single spin. The second effect is an anomalous emergent long timescale and a "prethermalized" regime that occurs for even weak single-spin dephasing. This effect allows one to have strong spin squeezing over a long transient time even though the level of spin squeezing in the steady state is very small. We also discuss a general hybrid-systems approach for implementing dissipative spin squeezing that does not require squeezed input light or complex multi-level atoms, but instead makes use of bosonic reservoir-engineering ideas. Our protocol is compatible with a variety of platforms, including trapped ions, NV defect spins coupled to diamond optomechanical crystals, and spin ensembles coupled to superconducting microwave circuits.

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