Characterization of coherent quantum frequency combs using electro-optic phase modulation

Abstract

We demonstrate a two-photon interference experiment for phase coherent biphoton frequency combs (BFCs), created through spectral amplitude filtering of biphotons with a continuous broadband spectrum. By using an electro-optic phase modulator, we project the BFC lines into sidebands that overlap in frequency. The resulting high-visibility interference patterns provide an approach to verify frequency-bin entanglement even with slow single-photon detectors; we show interference patterns with visibilities that surpass the classical threshold for qubit and qutrit states. Additionally, we show that with entangled qutrits, two-photon interference occurs even with projections onto different final frequency states. Finally, we show the versatility of this scheme for weak-light measurements by performing a series of two-dimensional experiments at different signal-idler frequency offsets to measure the dispersion of a single-mode fiber.

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• 648 Hilbert space dimensionality in a biphoton frequency comb
• Quantum frequency combs and Hong-Ou-Mandel interferometry: the role of spectral phase coherence
• High-Dimensional Entanglement for Quantum Communication in the Frequency Domain
• Time-resolved Hanbury Brown-Twiss interferometry of on-chip biphoton frequency combs using Vernier phase modulation
• On-chip frequency-bin quantum photonics
• Nine-Path Quantum Interferometry over 60 km
• Polarization diversity phase modulator for measuring frequency-bin entanglement of a biphoton frequency comb in a depolarized channel
• Nonlocal subpicosecond delay metrology using spectral quantum interference
• Synthetic photonic lattice for single-shot reconstruction of frequency combs