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Nuclear Spin Squeezing in Helium-3 by Continuous Quantum Nondemolition Measurement
Alan Serafin1, Matteo Fadel2, Philipp Treutlein2
1Laboratoire Kastler Brossel, ENS-Université PSL, CNRS, Université de la Sorbonne et Collège de France, 24 rue Lhomond, 75231 Paris, France.
We developed a new light-based method to control the quantum nuclear spin of helium-3 gas. This technique allows for precise quantum control and preparation of spin-squeezed states for quantum technology applications.
Area of Science:
- Quantum physics
- Atomic physics
- Quantum optics
Background:
- Macroscopic nuclear spin control is crucial for quantum technologies.
- Helium-3 nuclear spin states possess long coherence times.
- Existing methods for nuclear spin control are limited.
Purpose of the Study:
- To propose a novel technique for controlling the collective nuclear spin of helium-3 gas in the quantum regime.
- To establish a quantum nondemolition interaction between nuclear spins and light.
Main Methods:
- Utilizing metastability exchange collisions to couple optically accessible metastable states with ground-state nuclear spins.
- Implementing a light-mediated interaction to achieve a Faraday form quantum nondemolition interaction.
- Employing measurement-based quantum control strategies.
Main Results:
- Demonstrated an effective nuclear spin-light quantum nondemolition interaction.
- Enabled measurement-based quantum control of helium-3 nuclear spins.
- Showcased the preparation of spin-squeezed states.
Conclusions:
- The proposed technique offers a new pathway for quantum control of nuclear spins.
- The long coherence times of helium-3 nuclear spins combined with this control method are promising for quantum technology.
- Potential applications include enhanced quantum sensing and quantum information processing.
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