A high-speed tunable beam splitter for feed-forward photonic quantum information processing

Details A high-speed tunable beam splitter for feed-forward photonic quantum information processing A high-speed tunable beam splitter for feed-forward photonic quantum information processing

2011-09-08

arxiv.org/abs/1109.1762v2

Optics Express, Vol. 19, Issue 23, pp. 22723-22730 (2011)

Physics

Quantum Physics

Scientific paper

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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