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High optical efficiency and photon noise limited sensitivity of microwave kinetic inductance detectors using phase readout

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arxiv 1311.2429 v1 pith:DP4K6RQG submitted 2013-11-11 physics.ins-det astro-ph.IMcond-mat.supr-con

High optical efficiency and photon noise limited sensitivity of microwave kinetic inductance detectors using phase readout

classification physics.ins-det astro-ph.IMcond-mat.supr-con
keywords opticalbeamdetectorsefficiencyinductancekineticlimitedmicrowave
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We demonstrate photon noise limited performance in both phase and amplitude readout in microwave kinetic inductance detectors (MKIDs) consisting of NbTiN and Al, down to 100 fW of optical power. We simulate the far field beam pattern of the lens-antenna system used to couple radiation into the MKID and derive an aperture efficiency of 75%. This is close to the theoretical maximum of 80% for a single-moded detector. The beam patterns are verified by a detailed analysis of the optical coupling within our measurement setup.

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