Abstract
We experimentally demonstrate that the bandwidth of single photons laser pulse is compressed by a factor of 58 in a periodically poled lithium niobate (PPLN) waveguide chip. A positively chirped single photons laser pulse and a negatively chirped classical laser pulse are employed to produce a narrowband single photon pulse with new frequency through sum-frequency generation. In our experiment, the frequency and bandwidth of single photons at 1550 nm are simultaneously converted. Our results mark a critical step towards the realization of coherent photonic interface between quantum communication at 1550 nm and quantum memory in the near-visible window.
Highlights
We experimentally demonstrate that the bandwidth of single photons laser pulse is compressed by a factor of 58 in a periodically poled lithium niobate (PPLN) waveguide chip
It is highly expected that a coherent photonic interface is necessary which is capable of spectrum compressing and frequency conversing in the telecom band simultaneously
The laser pulse source is divided into two replicas using a 50:50 polarization maintaining beam splitter (BS), and one of the two replicas of laser pulse is sent to a broadband fiber Bragg grating 1 (FBG1), and at the same time, the other laser pulse is coupled into the FBG2
Summary
We experimentally demonstrate that the bandwidth of single photons laser pulse is compressed by a factor of 58 in a periodically poled lithium niobate (PPLN) waveguide chip. In the proposed methods of refs 34–36, spectrum compressing and frequency conversing technologies are not in 1550-nm telecommunications band, which is not appropriate for conventional quantum communication using all-optical-fiber networks. In this Letter, we exploit a SFG process with a negatively chirped classical laser pulse and a positively chirped single photons laser pulse, which the bandwidth of the positively chirped single photons laser pulse is compressed in a PPLN waveguide chip—from 800 GHz to 13.7 GHz—which is approaching the bandwidth regime of some quantum memories[37,38]. Spectral compressed single photons coherent pulse is generated by SFG between a negatively chirped classical laser pulse and a positively chirped single photons laser pulse.
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