Linear Optical Quantum Computing in a Single Spatial Mode
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 scheme. Our scheme is suited to 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.
Cite
@article{arxiv.1305.3592,
title = {Linear Optical Quantum Computing in a Single Spatial Mode},
author = {Peter C. Humphreys and Benjamin J. Metcalf and Justin B. Spring and Merritt Moore and Xian-Min Jin and Marco Barbieri and W. Steven Kolthammer and Ian A. Walmsley},
journal= {arXiv preprint arXiv:1305.3592},
year = {2014}
}
Comments
5 pages, 4 figures. Updated to be consistent with the published version