2007/04/09 by Patrick M. Leung, Timothy C. Ralph
Computer Science · Physics and Astronomy · #Computer science #Controlled NOT gate #Fidelity #Photon #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum Zeno effect #Quantum decoherence #Quantum error correction #Quantum mechanics #Qubit #Sign (mathematics) #Zeno's paradoxes #quant-ph
paper · pdf · doi:10.1088/1367-2630/9/7/224
5 pages
arxiv created 2007/04/09 · openalex publication_date 2007/07/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 = 10 4 . We include some mode-mismatch effects and estimate the bounds on the mode overlap and κ for which fault tolerant operation would be possible.