Single-photon two-qubit SWAP gate for entanglement manipulation

Abstract

A SWAP operation between different types of qubits of single photons is essential for manipulating hyperentangled photons for a variety of applications. We have implemented an efficient SWAP gate for the momentum and polarization degrees of freedom of single photons. The SWAP gate was utilized in a single-photon two-qubit quantum logic circuit to deterministically transfer momentum entanglement between a pair of down-converted photons to polarization entanglement. The polarization entanglement thus obtained violates Bell's inequality by more than 150 standard deviations.

Changes in the body of the paper, one reference added, typos corrected

References in corpus (4)

• Hyperentanglement-assisted Bell-state analysis
• Deterministic Controlled-NOT gate for single-photon two-qubit quantum logic
• Generation of ultrabright tunable polarization entanglement without spatial, spectral, or temporal constraints
• Low-cost nanosecond electronic coincidence detector

Cited by in corpus (15)

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• Protocols and quantum circuits for implementing entanglement concentration in cat state, GHZ-like state and 9 families of 4-qubit entangled states
• Complete physical simulation of the entangling-probe attack on the BB84 protocol
• Universal Dephasing Control During Quantum Computation
• Attacking quantum key distribution with single-photon two-qubit quantum logic
• Recent advances in high-dimensional mode-locked quantum frequency combs
• A chip-scale polarization-spatial-momentum quantum SWAP gate in silicon nanophotonics
• Experimental ancilla-assisted phase-estimation in a noisy channel
• Implementations of more general solid-state (SWAP)${}^{1/m}$ and controlled-(swap)${}^{1/m}$ gates
• Scalable quantum neural networks by few quantum resources
• Skyrmionic qubits stabilized by Dzyaloshinskii-Moriya interaction as platforms for qubits and quantum gates
• A proposal for a conditional definition of the Swap Gate