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Precision Metrology using Double-Pass Continuous Quantum Measurement

Ben Baragiola, University of New Mexico

(Session 5 : Friday from 5:00-7:00)

Abstract. We summarize an ongoing study of continuously measured double-pass quantum systems relevant for quantum-limited metrology. Numerical calculations of the quantum Fisher information for the exact quantum filter indicate improved uncertainty scaling over single-pass geometry, yet quantum Kalman filters show no enhancement. We investigate other approximate filters which we hope will close this gap.