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Linear Optical Quantum Computing in a Single Spatial Mode

2013; American Physical Society; Volume: 111; Issue: 15 Linguagem: Inglês

10.1103/physrevlett.111.150501

1092-0145

Peter C. Humphreys, Benjamin J. Metcalf, Justin B. Spring, M.W. Moore, Xian‐Min Jin, Marco Barbieri, W. Steven Kolthammer, Ian A. Walmsley,

Optical Network Technologies

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.