Fig. 4: Quantum measurements on a metasurface-based interferometer. | Light: Science & Applications

Fig. 4: Quantum measurements on a metasurface-based interferometer.

From: Metasurface interferometry toward quantum sensors

Fig. 4

a Schematic view of the metasurface-based interferometer using a time delay τ between the two input photons. b Selected time delays τ illustrated at the HOM-dip measurement. c Experimental results for the two-photon state with three different time delays τ after passing through the MBI. The count rates at both detectors are independent of the introduced phase ϕ and the time delay τ. The measured coincidence rates show an oscillatory behavior with lower visibility at higher delaytimes. The obtained visibility values are 86.8 ± 1.1% for the case of no time delay, 67 ± 2% for \(\tau = 3.0\,{\mathrm{ps}}\) and 44 ± 5% for \(\tau = 17.7\,{\mathrm{ps}}\)

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