Abstract
The realization of high-speed tunable delay control has received significant attention in the scene of classical photonics. In quantum optics, however, such rapid delay control systems for entangled photons have remained undeveloped. Here for the first time, we demonstrate rapid (2.5 MHz) modulation of signal-idler arrival times through electro-optic pump frequency modulation. Our technique applies the quantum phenomenon of nonlocal dispersion cancellation along with pump frequency tuning to control the relative delay between photon pairs. Chirped fiber Bragg gratings are employed to provide large amounts of dispersion which result in biphoton delays exceeding 30 ns. This rapid delay modulation scheme could be useful for on-demand single-photon distribution in addition to quantum versions of pulse position modulation.
Highlights
Time-frequency entangled photon pairs (“biphotons”) can exhibit strong correlations in both the spectral and temporal degrees of freedom
Large-alphabet quantum key distribution based on arrival-time measurements of entangled photons has been proposed and demonstrated in multiple configurations.[5,6,7,8,9]
We show MHz switching of biphoton delays through electro-optic pump frequency modulation
Summary
Time-frequency entangled photon pairs (“biphotons”) can exhibit strong correlations in both the spectral and temporal degrees of freedom. High-speed switching of biphoton delays through electro-optic pump frequency modulation We demonstrate such a dispersion-based (rather than delay-line-based) approach to realize a high-speed biphoton switch.
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