Nuclear spin squeezing in Helium-3 by continuous quantum nondemolition measurement

• URL: http://arxiv.org/abs/2012.07216v1
• Date: Mon, 14 Dec 2020 02:23:09 GMT
• Title: Nuclear spin squeezing in Helium-3 by continuous quantum nondemolition measurement
• Abstract summary: We propose a technique to control the macroscopic collective nuclear spin of a Helium-3 vapor in the quantum regime using light. The scheme relies on metastability exchange collisions to mediate interactions between optically accessible metastable states and the ground-state nuclear spin.
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• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: We propose a technique to control the macroscopic collective nuclear spin of a Helium-3 vapor in the quantum regime using light. The scheme relies on metastability exchange collisions to mediate interactions between optically accessible metastable states and the ground-state nuclear spin, giving rise to an effective nuclear spin-light quantum nondemolition interaction of the Faraday form. Our technique enables measurement-based quantum control of nuclear spins, such as the preparation of spin-squeezed states. This, combined with the day-long coherence time of nuclear spin states in Helium-3, opens the possibility for a number of applications in quantum technology.

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