Qubus computation - art. no. 63050D

W. J. Munro*, Kae Nemoto, T. P. Spiller, P. Van Loock, Samuel L. Braunstein, G. J. Milburn

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Processing information quantum mechanically is known to enable new communication and computational scenarios that cannot be accessed with conventional information technology (IT). We present here a new approach to scalable quantum computing - a "qubus computer" - which realizes qubit measurement and quantum gates through interacting qubits with a quantum communication bus mode. The qubits could be "static" matter qubits or "flying" optical qubits, but the scheme we focus on here is particularly suited to matter qubits. Universal two-qubit quantum gates may be effected by schemes which involve measurement of the bus mode, or by schemes where the bus disentangles automatically and no measurement is needed. This approach enables a parity gate between qubits, mediated by a bus, enabling near-deterministic Bell state measurement and entangling gates. Our approach is therefore the basis for very efficient, scalable QIP, and provides a natural method for distributing such processing, combining it with quantum communication.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 8 Nov 2006
EventConference on Quantum Communications and Quantum Imaging IV - San Diego, California, United States
Duration: 13 Aug 200614 Aug 2006


ConferenceConference on Quantum Communications and Quantum Imaging IV
Country/TerritoryUnited States
CitySan Diego, California


  • Coherent light channel
  • Distributed information processing
  • Geometric two qubit gate
  • Universal quantum computation

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