## arXiv Analytics

### arXiv:1908.04765 [quant-ph]AbstractReferencesReviewsResources

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

Published 2019-08-13Version 1

Variable measurement operators enable the optimization of strategies for testing quantum properties and the 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 $\hat{\rho}$. We combine $\hat{\rho}$ with a coherent state $|\alpha\rangle$ on a balanced beam splitter, and detect light at both output ports using photon-number-resolving transition edge sensors. We observe that the discrete difference statistics converge to the quadrature distribution of $\hat{\rho}$ as we increase $|\alpha|$. Moreover, in a proof-of-principle demonstration of state engineering, we show the ability to control the photon-number distribution of a state that is heralded using our weak-field homodyne detector.

Comments: 12 pages, 10 figures; includes Supplemental Material
Categories: quant-ph
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