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arXiv:2104.10363 · Physical Review X

Reservoir-Engineered Spin Squeezing: Macroscopic Even-Odd Effects and Hybrid-Systems Implementations

Peter Groszkowski, Martin Koppenhöfer, Hoi-Kwan Lau, Aashish A. Clerk

Published Jan 24, 2022• 37 citations
arXivHTMLPDF

Abstract

A new way to stabilize highly entangled spin-squeezed states for precision sensing is simpler to implement and exhibits an unusual sensitivity to the number of spins as well as emergent slow timescales.
DOI
10.1103/physrevx.12.011015

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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. 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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