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quant-ph2026
Enhanced Atomic Magnetometry with a Pinched Spin State
Tingxuan Guo, Xiangyu Li, Yang Li +1
The sensitivity of an atomic spin sensor is fundamentally constrained by the quantum Fisher information (QFI) of the probe state. The pinched state, , has an …
quant-ph2021★ 8 cited
Zero-field spin noise spectrum of an alkali vapor with strong spin-exchange coupling
Ya Wen, Xiangyu Li, Guiying Zhang +1
We study the zero-field optical spin noise spectra (OSN) for a thermal state hot 87Rb vapor with strong spin exchange coupling. Our main findings are: (1) The OSN spectrum consists…
quant-ph2018★ 168 cited
Measurements with prediction and retrodiction on the collective spin of 10^{11} atoms beat the standard quantum limit
Han Bao, Junlei Duan, Xingda Lu +10
Quantum probes using uncorrelated particles give a limit on the measurement sensitivity referred to as the standard quantum limit (SQL). The SQL, however, can be overcome by ex…