Experimental position-time entanglement with degenerate single photons

Abstract

We report an experiment in which two-photon interference occurs between degenerate single photons that never meet. The two photons travel in opposite directions through our fibre-optic interferometer and interference occurs when the photons reach two different, spatially separated, 2-by-2 couplers at the same time. We show that this experiment is analogous to the conventional Franson-type entanglement experiment where the photons are entangled in position and time. We measure wavefunction overlaps for the two photons as high as 94 $\pm$ 3%.

Updated to published version, new fig. 4., corrected typos

References in corpus (5)

• Quantum Cryptography using entangled photons in energy-time Bell states
• Entanglement formation and violation of Bell's inequality with a semiconductor single photon source
• Quantum teleportation with a quantum dot single photon source
• Continuous operation of a one-way quantum key distribution system over installed telecom fibre
• Radiative emission dynamics of quantum dots in a single cavity micropillar

Cited by in corpus (2)

• Photonic qubits, qutrits and ququads accurately prepared and delivered on demand
• Entangling distant quantum dots using classical interference