Measurement of a quantum system using spin-mechanical conversion

• URL: http://arxiv.org/abs/2603.02507v1
• Date: Tue, 03 Mar 2026 01:37:56 GMT
• Title: Measurement of a quantum system using spin-mechanical conversion
• Authors: A. A. Wood, D. S. Rice, T. Xie, F. H. Cassells, R. M. Goldblatt, T. Delord, G. Hétet, A. M. Martin,
• Abstract summary: We convert a quantum measurement on an ensemble of spins into a macroscopic rotation of the host particle via spin-mechanical coupling.<n>We measure spin readout contrast in excess of 70%, and demonstrate pulsed mechanical detection of coherent Rabi oscillations.<n>Our results open up interesting new opportunities for levitated spin-mechanical systems using pulsed control.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Levitated macroscopic particles exhibiting quantum mechanical effects are garnering increased attention as a means for precision sensing and testing quantum mechanics. Defects in diamond, such as the nitrogen-vacancy (NV) centre possess optically-addressable spins with long coherence times at room temperature and offer an intriguing system to examine quantum spin dynamics coupled to a macroscopic classical particle. In this work, we convert the outcome of a quantum measurement on an ensemble of spins into a macroscopic rotation of the host particle via spin-mechanical coupling. Following a sequence of green laser and microwave control pulses, spin-mechanical coupling between the final qubit spin state and the host particle -- an electrically-levitated diamond -- exerts a torque on the particle that deflects a weak near-infra-red laser beam. We measure spin readout contrast in excess of 70\%, and demonstrate pulsed mechanical detection of coherent Rabi oscillations, spin-echo interferometry and $T_1$-induced relaxation. We directly measure with temporal resolution the particle reorientation from a 60\,attonewton-metre spin torque induced by flipping the spins. Our results open up interesting new opportunities for levitated spin-mechanical systems using pulsed control, from improved sensing to the prospect of realising macroscopic quantum superposition states.

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