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Observation of broadband entanglement in microwave radiation from a single time-varying boundary condition

Entangled pairs of microwave photons are commonly produced in the narrow frequency band of a resonator, which represents a modified vacuum density of states. We use a broadband, semi-infinite transmission line terminated by a superconducting quantum interference device (SQUID). A weak pump signal modulates the SQUID inductance, resulting in a single time-varying boundary condition. We detect both quadratures of the microwave radiation emitted at two different frequencies separated by 0.7~GHz. We determine the type and purity of entanglement from the noise correlations and an in-situ noise and power calibration.

preprint2018arXivOpen access
B. H. SchneiderA. BengtssonI. M. SvenssonT. ArefG. JohanssonJonas BylanderP. Delsing
quant-ph
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Open access7 authors1 topic
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B. H. SchneiderA. BengtssonI. M. SvenssonT. ArefG. JohanssonJonas BylanderP. Delsing

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