Narrow linewidth source of greatly non-degenerate photon pairs for quantum repeaters from a short singly-resonant cavity

Published

August 26, 2015

Author(s)

Oliver T. Slattery, Paulina S. Kuo, Lijun Ma, Xiao Tang

Abstract

Quantum repeaters require entangled photon pair sources to connect flying qubits in the telecommunication band and stationary qubits at atomic transition wavelengths and linewidths for quantum memories. We have experimentally implemented a narrow linewidth source of greatly non-degenerate single photon pairs at the strategic wavelengths of 894.6 nm (D1 transition line of cesium) and 1312.5 nm (telecommunications band). Based on Spontaneous Parametric Down- Conversion (SPDC), the photon pairs are generated from a periodically poled lithium niobate (PPLN) crystal embedded in a singly-resonant optical cavity for 894.6 nm. The cavity modes show a linewidth of approximately 48 MHz and separated by a large cavity free spectral range of approximately 4.5 GHz. We use volume Bragg grating (VBG) and a sum frequency generation (SFG) phase matching filters to efficiently select a small number of modes. The detected coincidence rate is nearly 4.9 S-1 mW-1pump MHz-1SPDC from the resonant cavity modes compared to 5.2X10-2 S-1 mW-1pump MHz-1SPDC for the single pass case.

Citation

Applied Physics B-Lasers and Optics

Volume

121

Pub Type

Journals

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DOI Link

Keywords

Quantum Repeater, Singly Resonant SPDC Cavity, Narrow linewidth single photon pair source, Non- degenerate SPDC source

Citation

Slattery, O. , Kuo, P. , Ma, L. and Tang, X. (2015), Narrow linewidth source of greatly non-degenerate photon pairs for quantum repeaters from a short singly-resonant cavity, Applied Physics B-Lasers and Optics, [online], https://doi.org/10.1007/s00340-015-6198-6 (Accessed October 3, 2025)