Patrick M Leung and Timothy C Ralph 2007 New J. Phys. 9 224 doi:10.1088/1367-2630/9/7/224
Optical zeno gate: bounds for fault tolerant operation
Focus on Measurement-Based Quantum Information ProcessingPatrick M Leung and Timothy C Ralph
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In principle the Zeno effect controlled-sign gate of Franson et al (2004 Phys. Rev. A 70 062302) is a deterministic two-qubit optical gate. However, when realistic values of photon loss are considered its fidelity is significantly reduced. Here we consider the use of measurement based quantum processing techniques to enhance the operation of the Zeno gate. With the help of quantum teleportation, we show that it is possible to achieve a Zeno CNOT gate (GC-Zeno gate) that gives (near) unit fidelity and moderate probability of success of 0.8 with a two-photon to one-photon absorption ratio κ = 104. We include some mode-mismatch effects and estimate the bounds on the mode overlap and κ for which fault tolerant operation would be possible.
- PACS
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03.67.Lx Quantum computation architectures and implementations
03.67.Mn Entanglement measures, witnesses, and other characterizations
- Subjects
- Dates
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Issue 7 (July 2007)
Received 7 April 2007
Published 11 July 2007
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Optical zeno gate: bounds for fault tolerant operation
Patrick M Leung and Timothy C Ralph 2007 New J. Phys. 9 224
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