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Linear Optical Quantum Computing in a Single Spatial Mode

Peter C. Humphreys, Benjamin J. Metcalf, Justin B. Spring, Merritt Moore, Xian-Min Jin, Marco Barbieri, W. Steven Kolthammer, and Ian A. Walmsley
Phys. Rev. Lett. 111, 150501 – Published 9 October 2013
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Abstract

We present a scheme for linear optical quantum computing using time-bin-encoded qubits in a single spatial mode. We show methods for single-qubit operations and heralded controlled-phase (cphase) gates, providing a sufficient set of operations for universal quantum computing with the Knill-Laflamme-Milburn [Nature (London) 409, 46 (2001)] scheme. Our protocol is suited to currently available photonic devices and ideally allows arbitrary numbers of qubits to be encoded in the same spatial mode, demonstrating the potential for time-frequency modes to dramatically increase the quantum information capacity of fixed spatial resources. As a test of our scheme, we demonstrate the first entirely single spatial mode implementation of a two-qubit quantum gate and show its operation with an average fidelity of 0.84±0.07.

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  • Received 15 May 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.150501

© 2013 American Physical Society

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It’s a Good Time for Time-Bin Qubits

Published 9 October 2013

Qubits encoded in time advance the prospects for quantum computing with single photons.

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Authors & Affiliations

Peter C. Humphreys1, Benjamin J. Metcalf1, Justin B. Spring1, Merritt Moore1, Xian-Min Jin1,2, Marco Barbieri1, W. Steven Kolthammer1, and Ian A. Walmsley1

  • 1Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom
  • 2Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China

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Issue

Vol. 111, Iss. 15 — 11 October 2013

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