Introduction

This work reports on the pilot study, performed by INRIM, NPL and PTB, on the measurement of the g (2) (0) parameter in the visible spectral range of a test single-photon source based on a colour centre in diamond. The development of single-photon sources is of great interest to the metrology community as well as the burgeoning quantum technologies industry. Measurement of the g (2) (0) parameter plays a vital role in characterising and understanding single-photon emission. This comparison has been conducted by each partner individually using their own equipment at INRIM laboratories, which were responsible for the operation of the source. *

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Fast time-domain measurements on telecom single photons

Allgaier

Vigh

Ansari

et al. 2017

Quantum Sci. Technol.

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Abstract. Direct measurements on the temporal envelope of quantum light are a challenging task and not many examples are known since most classical pulse characterisation methods do not work on the single photon level. Knowledge of both spectrum and timing can however give insights on properties that cannot be determined by the spectrum alone. While temporal measurements on single photons on timescales of tens of picoseconds are possible with superconducting photon detectors and picosecond measurements have been performed using streak cameras, there are no commercial single photon sensitive devices with femtosecond resolution available. While time-domain sampling using sumfrequency generation has been already exploited for such measurement, inefficient conversion has necessitated long integration times to build the temporal profile. We demonstrate a highly efficient waveguided sum-frequency generation process in Lithium Niobate to measure the temporal envelope of single photons with femtosecond resolution with short enough acquisition time to provide a live-view of the measurement. We demonstrate the measurement technique and combine it with spectral measurements using a dispersive fiber time-of-flight spectrometer to determine upper and lower bounds for the spectral purity of heralded single photons. The approach complements the joint spectral intensity measurements as a measure on the purity can be given without knowledge of the spectral phase.arXiv:1702.03240v1 [quant-ph]

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Introduction

Cited by 5 publications

References 191 publications

Selfish mining attack in blockchain: a systematic literature review

Selfish mining attack in blockchain: a systematic literature review

Feasibility study towards comparison of the g ⁽²⁾(0) measurement in the visible range

Fast time-domain measurements on telecom single photons

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Introduction

Cited by 5 publications

References 191 publications

Selfish mining attack in blockchain: a systematic literature review

Selfish mining attack in blockchain: a systematic literature review

Feasibility study towards comparison of the g (2)(0) measurement in the visible range

Fast time-domain measurements on telecom single photons

Contact Info

Product

Resources

About

Feasibility study towards comparison of the g ⁽²⁾(0) measurement in the visible range