2013/05/31 by Peter C. Humphreys, Benjamin J. Metcalf, Justin B. Spring +7 · 3 citations
Computer Science · Engineering · Mathematics · Physics and Astronomy · #Computer science #Fidelity #Mathematics #Mode (computer interface) #Neural Networks and Reservoir Computing #Optical Network Technologies #Physics #Quantum #Quantum Information and Cryptography #Quantum computer #Quantum gate #Quantum information #Quantum mechanics #Qubit #Scheme (mathematics) #Telecommunications #Topology (electrical circuits) #quant-ph
paper · pdf · doi:10.1103/physrevlett.111.150501
published as Phys. Rev. Lett. 111, 150501 (2013) · 5 pages, 4 figures. Updated to be consistent with the published version
openalex publication_date 2013/10/09 · arxiv created 2014/11/21 · arxiv updated 2014/11/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.