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A Time-Bin Qubit Entangler based on Photon Switching

Hiroki Takesue

Published Jan 1, 2014• 0 citations
Publisher

Abstract

I present a simple scheme for entangling two independent time-bin qubits using quantum interference at a high-speed 2×2 optical switch. Non-classical two photon interference fringes were observed experimentally by using the proposed scheme.
DOI
10.1364/cleo_qels.2014.fth1a.7

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A time-bin qubit is a promising candidate qubit for advanced quantum information processing systems operating over optical fibers or integrated quantum photonic circuits. However, the single- and two-qubit operations of time-bin qubits have been largely unexplored compared with those of polarization qubits. Here, I present a simple scheme for implementing a basic two-qubit operation, namely an ``entangling'' operation of two independent time-bin qubits, based on Hong-Ou-Mandel quantum interference in a high-speed $2\ifmmode\times\else\texttimes\fi{}2$ optical switch. With the proposed scheme, the formation of a time-bin entanglement was confirmed experimentally.
Time-bin entanglement is a critical resource in quantum information science owing to its exceptional robustness over long-distance channels. Achieving high quantum interference visibility is indispensable for fundamental research and practical applications. To date, a model that can accurately describe time-bin entanglement-based two-photon interference remains to be established. In this work, we analyze the underlying mechanisms for this type of interference and develop an effective model for experimentally optimizing the quantum interference visibility. We use this model to analyze the factors contributing to the decline in interference visibility and offer strategies to address these issues, and we also demonstrate its effectiveness through experiments. Our model can serve as a tool for time-bin entanglement-based systems, aiding in system design, the evaluation of expected outcomes, and the optimization of experimental setups.