Continuous field tracking with machine learning and steady state spin squeezing
arxiv(2024)
摘要
Entanglement plays a crucial role in proposals for quantum metrology, yet
demonstrating quantum enhancement in sensing with sustained spin entanglement
remains a challenging endeavor. Here, we combine optical pumping and continuous
quantum nondemolition measurements to achieve a sustained spin squeezed state
with 4 × 10^10 hot atoms. A metrologically relevant steady state
squeezing of -3.23 ± 0.24 dB using prediction and retrodiction is
maintained for about one day. We employ the system to track different types of
continuous time-fluctuating magnetic fields, where we construct deep learning
models to decode the measurement records from the optical signals. Quantum
enhancement due to the steady spin squeezing is verified in our atomic
magnetometer. These results represent important progress towards applying
long-lived quantum entanglement resources in realistic settings.
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