A monolithically integrated polarization entangled photon pair source on a silicon chip

Abstract

Integrated photonic circuits are one of the most promising platforms for large-scale photonic quantum information systems due to their small physical size and stable interferometers with near-perfect lateral-mode overlaps. Since many quantum information protocols are based on qubits defined by the polarization of photons, we must develop integrated building blocks to generate, manipulate, and measure the polarization-encoded quantum state on a chip. The generation unit is particularly important. Here we show the first integrated polarization-entangled photon pair source on a chip. We have implemented the source as a simple and stable silicon-on-insulator photonic circuit that generates an entangled state with 91 \pm 2% fidelity. The source is equipped with versatile interfaces for silica-on-silicon or other types of waveguide platforms that accommodate the polarization manipulation and projection devices as well as pump light sources. Therefore, we are ready for the full-scale implementation of photonic quantum information systems on a chip.

References in corpus (6)

• Photonic quantum technologies
• Silica-on-Silicon Waveguide Quantum Circuits
• Quantum walks of correlated particles
• Shor's quantum factoring algorithm on a photonic chip
• Polarization entangled state measurement on a chip
• Increasing singlet fraction with entanglement swapping

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• Testing foundations of quantum mechanics with photons
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• Silicon photonic processor of two-qubit entangling quantum logic
• Slow light enhanced correlated photon pair generation in photonic-crystal coupled-resonator optical waveguides
• On-chip generation and demultiplexing of quantum correlated photons using a silicon-silica monolithic photonic integration platform
• High visibility two photon interference of frequency time entangled photons generated in a quasi phase matched AlGaAs waveguide
• Entangling time-bin qubits with a switch
• Generation of entangled photons using an arrayed waveguide grating