Optical Zeno Gate: Bounds for Fault Tolerant Operation

Abstract

In principle the Zeno effect controlled-sign gate of Franson et al's (PRA 70, 062302, 2004) 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 0.76 with a one-photon to two-photon transmission ratio $\kappa =10^4$. We include some mode-mismatch effects and estimate the bounds on the mode overlap and $\kappa$ for which fault tolerant operation would be possible.

5 pages

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• Optical Quantum Computation
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• Quantum Computing in Plato's Cave
• Non-Abelian Phases from a Quantum Zeno Dynamics
• Entangling photons via the double quantum Zeno effect
• Improving photon detector efficiency using a high-fidelity optical CNOT gate