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 .
- Received 15 May 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.150501
© 2013 American Physical Society
Viewpoint
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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