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IEEE Journal of Quantum Electronics

Optical delay line memory

H. J. Schulte, Alexander Rack

Published Jun 1, 1967• 5 citations
Publisher
DOI
10.1109/jqe.1967.1074502

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We demonstrate a high-efficiency, free space optical delay line utilizing a nested multipass cell architecture. This design supports extended optical paths with low loss, aided by custom broadband dielectric coatings that provide high reflectivity across a wide spectral bandwidth. The cell is characterized using polarization-entangled photon pairs, with signal photons routed through the delay line and idler photons used as a timing reference. Quantum state tomography performed on the entangled pairs reveals entanglement preservation with fidelity of 99.6(9)% following a single-transit delay of up to 687 ns, accompanied by a photon retrieval efficiency of 95.390(5)%. The delay is controllable and can be set between 1.8 and 687 ns in ∼12.6 ns increments. These results position this delay line as a strong candidate for all-optical quantum memories and synchronization modules for scalable quantum networks.
A new structure for storing a radio frequency (RF) signal utilising a fibre-optic delay line is presented. It is based on a frequency shifting recirculating delay line loop for the RF pulse storage, which prevents lasing and enables multiple recirculations and long storage time to be realised. The new photonic RF memory (PRFM) can realise a long reconfigurable storage time, wide instantaneous bandwidth and high dynamic range. Experimental demonstration of the frequency shifting loop based PRFM has been carried out for the first time, showing a long and reconfigurable storage time of more than 300 μs with high signal fidelity.