Entanglement generation using a controlled-phase gate for time-bin qubits

Abstract

Quantum logic gates are important for quantum computations and quantum information processing in numerous physical systems. While time-bin qubits are suited for quantum communications over optical fiber, many essential quantum logic gates for them have not yet been realized. Here, we demonstrated a controlled-phase (C-Phase) gate for time-bin qubits that uses a 2x2 optical switch based on an electro-optic modulator. A Hong-Ou-Mandel interference measurement showed that the switch could work as a time-dependent beam splitter with a variable spitting ratio. We confirmed that two independent time-bin qubits were entangled as a result of the C-Phase gate operation with the switch.

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Cited by in corpus (6)

• Linear Optical Quantum Computation with Frequency-Comb Qubits and Passive Devices
• Quantum process tomography of a controlled-phase gate for time-bin qubits
• Low-Loss High-Fidelity Frequency-Mode Hadamard Gates Based on Electromagnetically Induced Transparency
• Scalable implementation of $(d+1)$ mutually unbiased bases for $d$-dimensional quantum key distribution
• Generation of a time-bin Greenberger--Horne--Zeilinger state with an optical switch
• N-qubit universal quantum logic with a photonic qudit and O(N) linear optics elements