The correlations between photons generated by nonlinear optical processes offer advantages for many quantum technology applications, including spectroscopy, imaging, and metrology. Here, we use spontaneous four-wave mixing in a birefringent single-mode fiber pumped by a tunable pulsed laser as a broadly tunable source of phase-matched non-degenerate photon pairs for spectroscopy. The pairs are tunable such that the idler beam measures the transmittance spectrum of a sample in the near infrared, while the visible signal beam independently reports correlation information. By the time-resolved counting of both signal and idler photons, we use photon-number correlations to remove uncorrelated noise from the probe beam. Here, we have used heralded spectroscopy to measure the absorption spectrum of gallium arsenide near its band edge, despite the idler photon spectrum being dominated by a large background from spontaneous Raman scattering.
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3 August 2020
Research Article|
August 03 2020
Heralded spectroscopy with a fiber photon-pair source
Special Collection:
Quantum Sensing with Correlated Light Sources
E. Pearce
;
E. Pearce
Blackett Laboratory, Department of Physics, Imperial College London
, London SW7 2AZ, United Kingdom.
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C. C. Phillips
;
C. C. Phillips
Blackett Laboratory, Department of Physics, Imperial College London
, London SW7 2AZ, United Kingdom.
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R. F. Oulton
;
R. F. Oulton
Blackett Laboratory, Department of Physics, Imperial College London
, London SW7 2AZ, United Kingdom.
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A. S. Clark
A. S. Clark
a)
Blackett Laboratory, Department of Physics, Imperial College London
, London SW7 2AZ, United Kingdom.
a)Author to whom correspondence should be addressed: alex.clark@imperial.ac.uk
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a)Author to whom correspondence should be addressed: alex.clark@imperial.ac.uk
Note: This paper is part of the APL Special Collection on Quantum Sensing with Correlated Light Sources
Appl. Phys. Lett. 117, 054002 (2020)
Article history
Received:
June 01 2020
Accepted:
July 22 2020
Citation
E. Pearce, C. C. Phillips, R. F. Oulton, A. S. Clark; Heralded spectroscopy with a fiber photon-pair source. Appl. Phys. Lett. 3 August 2020; 117 (5): 054002. https://doi.org/10.1063/5.0016106
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