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

Author(s): S. Zotter, N. Tetik, A. Qarry, T. Jennewein, A. Zeilinger

Journal: Optics Express

Volume: 19

Page(s): 22723-22730

Year: 2011

DOI Number: 10.1364/OE.19.022723

Link: Link to publication


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.

Note: http://arxiv.org/abs/1109.1762

File: Link to PDF

Zeilinger Group Zeilinger Group