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Tuning between photon-number and quadrature measurements with weak-field homodyne detection



G Thekkadath, David Phillips, Jacob Bulmer, W.R. Clements, A. Eckstein, B.A. Bell, J Lugani, Adriana Lita, Sae Woo Nam, Thomas Gerrits, C.G. Wade, Ian Walmsley


Variable measurement operators enable optimization of strategies for testing quantum properties and for preparation of a range of quantum states. Here, we experimentally implement a weak-field homodyne detector that can continuously tune between performing a photon-number measurement and a field quadrature measurement on a quantum state ρ. We combine ρ with a coherent state |α> on a balanced beam splitter, and detect light at both output ports using photon-number-resolving transition edge sensors. We observe the discrete difference statistics converge to the quadrature distribution of ρ as we increase |α|. Moreover, in a proof-of-principle demonstration of state engineering, we show the ability to control the photon-number distribution of a state heralded using our weak-field homodyne detector.
Physical Review Letters


weak field homodyne detector, heralded state generation, quantum optics, transition edge sensor


Thekkadath, G. , Phillips, D. , Bulmer, J. , Clements, W. , Eckstein, A. , Bell, B. , Lugani, J. , Lita, A. , Nam, S. , Gerrits, T. , Wade, C. and Walmsley, I. (2020), Tuning between photon-number and quadrature measurements with weak-field homodyne detection, Physical Review Letters, [online], (Accessed May 26, 2024)


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Created March 20, 2020, Updated April 9, 2024