On photonic controlled phase gates

Abstract

As primitives for entanglement generation, controlled phase gates take a central role in quantum computing. Especially in ideas realizing instances of quantum computation in linear optical gate arrays a closer look can be rewarding. In such architectures, all effective non-linearities are induced by measurements: Hence the probability of success is a crucial parameter of such quantum gates. In this note, we discuss this question for controlled phase gates that implement an arbitrary phase with one and two control qubits. Within the class of post-selected gates in dual-rail encoding with vacuum ancillas we identify the optimal success probabilities. We construct networks that allow for an implementation by means of todays experimental capabilities in detail. The methods employed here appear specifically useful with the advent of integrated linear optical circuits, providing stable interferometers on monolithic structures.

9 pages, 6 figures, final version

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Cited by in corpus (16)

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• Quantum-Logic Gate between Two Optical Photons with an Average Efficiency above 40%
• Experimental implementation of the optimal linear-optical controlled phase gate
• Experimental measurement-based quantum computing beyond the cluster-state model
• Experimental implementation of optimal linear-optical controlled-unitary gates
• Preparation of Knill-Laflamme-Milburn states using tunable controlled phase gate
• Entangling efficiency of linear-optical quantum gates
• Optimal implementation of two-qubit linear optical quantum filters
• Strategies for measurement-based quantum computation with cluster states transformed by stochastic local operations and classical communication
• A direct interferometric test of the nonlinear phase shift gate
• Scheme for a linear-optical controlled-phase gate with programmable phase shift
• Finding Photonics Circuits via $\delta$-weakening SMT
• Achievability of two qubit gates using linear optical elements and post-selection
• Linear optical fan-out gates using fewer ancillary single photons with enhanced success probability
• Optical Quantum Computing