Quantum Non-Demolition Measurement on the Spin Precession of Laser-Trapped ${}^{171}$Yb Atoms

Abstract

Quantum non-demolition (QND) measurement enhances the detection efficiency and measurement fidelity, and is highly desired for its applications in precision measurements and quantum information processing. We propose and demonstrate a QND measurement scheme for the spin states of laser-trapped atoms. On ${}^{171}$Yb atoms held in an optical dipole trap, a transition that is simultaneously cycling, spin-state selective, and spin-state preserving is created by introducing a circularly polarized beam of control laser to optically dress the spin states in the excited level, while leaving the spin states in the ground level unperturbed. We measure the phase of spin precession of $5\times 10^4$ atoms in a bias magnetic field of 20 mG. This QND approach reduces the optical absorption detection noise by $\sim$19 dB, to a level of 2.3 dB below the atomic quantum projection noise. In addition to providing a general approach for efficient spin-state readout, this all-optical technique allows quick switching and real-time programming for quantum sensing and quantum information processing.

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Cited by in corpus (3)

• Repetitive readout and real-time control of nuclear spin qubits in ${}^{171}$Yb atoms
• Extended two-body Rydberg blockade interaction with off-resonant modulated driving
• Low-noise environment for probing fundamental symmetries