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 mo...
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| Veröffentlicht in: | arXiv.org 2018-09 |
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| creator | Schneider, B H Bengtsson, A Svensson, I M Aref, T Johansson, G Bylander, Jonas Delsing, P |
| description | 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. |
| doi_str_mv | 10.48550/arxiv.1802.05529 |
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| subjects | Boundary conditions Broadband Entanglement Frequencies Inductance Microwaves Photons Physics - Quantum Physics Quadratures Quantum theory Superconducting quantum interference devices Transmission lines |
| title | Observation of broadband entanglement in microwave radiation from a single time-varying boundary condition |
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