TY - JOUR
AU - Athreya Shankar
AU - Graham Greve
AU - Baochen Wu
AU - James Thompson
AU - Murray Holland
AB - collective spin composed of N pseudospins. Quantum nondemolition measurements of a lossy cavity mode interacting with an atomic ensemble are used to directly probe the phase of the collective atomic spin without converting it into a population difference. Unlike traditional Ramsey measurement sequences, our scheme allows for real-time tracking of time-varying signals. As a bonus, spin-squeezed states develop naturally, providing real-time phase estimation significantly more precise than the standard quantum limit of Δ<em>ϕ</em><sub>SQL</sub>=1/√<em>N</em> rad.
BT - Physical Review Letters
DA - 2019-06
DO - 10.1103/PhysRevLett.122.233602
N2 - collective spin composed of N pseudospins. Quantum nondemolition measurements of a lossy cavity mode interacting with an atomic ensemble are used to directly probe the phase of the collective atomic spin without converting it into a population difference. Unlike traditional Ramsey measurement sequences, our scheme allows for real-time tracking of time-varying signals. As a bonus, spin-squeezed states develop naturally, providing real-time phase estimation significantly more precise than the standard quantum limit of Δ<em>ϕ</em><sub>SQL</sub>=1/√<em>N</em> rad.
PY - 2019
EP - 233602
T2 - Physical Review Letters
TI - Continuous Real-Time Tracking of a Quantum Phase Below the Standard Quantum Limit
UR - https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.233602
VL - 122
SN - 0031-9007
ER -