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  • Title: A high-speed tunable beam splitter for feed-forward photonic quantum information processing.
    Author: Ma XS, Zotter S, Tetik N, Qarry A, Jennewein T, Zeilinger A.
    Journal: Opt Express; 2011 Nov 07; 19(23):22723-30. PubMed ID: 22109153.
    Abstract:
    We realize quantum gates for path qubits with a high-speed, polarization-independent and tunable beam splitter. Two electro-optical modulators act in a Mach-Zehnder interferometer as high-speed phase shifters and rapidly tune its splitting ratio. We test its performance with heralded single photons, observing a polarization-independent interference contrast above 95%. The switching time is about 5.6 ns, and a maximal repetition rate is 2.5 MHz. We demonstrate tunable feed-forward operations of a single-qubit gate of path-encoded qubits and a two-qubit gate via measurement-induced interaction between two photons.
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