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We report an interferometer consisting of two spatially separated balanced Mach-Zehnder interferometers sharing a polarization entangled source. Nonlocal correlation statistics enable entanglement detection, Bell state identification, and fidelity bounding.
We present a new method for intrusion detection which is based on the Mach-Zehnder interference effect. This device provides monitored surveillance by continuously measuring the intensity of light collected by a pair of photodetectors.
Our balanced Franson interferometer allows observation locally of Hong-Ou-Mandel and biphoton de Broglie interference and non-local Franson interference with suppressed single-photon interference. Advantages are its size, pulsed source compatibility, and passive visibility monitoring.
We demonstrate a quantum optical seal using entangled photons to monitor the integrity of a fiber-optic channel subject to tampering. This application of quantum photonics provides a basis for physical layer security in cyber-physical systems.
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