Widely tunable single photon source with high purity at telecom wavelength

Abstract

Abstract:We theoretically and experimentally investigate the spectral tunability and purity of photon pairs generated from spontaneous parametric down conversion in periodically poled KTiOPO 4 crystal with group-velocity matching condition. The numerical simulation predicts that the purity of joint spectral intensity (P JSI ) and the purity of joint spectral amplitude (P JSA ) can be kept higher than 0.98 and 0.81, respectively, when the wavelength is tuned from 1460 nm to 1675 nm, which covers the S-, C-, L-, and U-band in telecommunication wavelengths. We also directly measured the joint spectral intensity at 1565 nm, 1584 nm and 1565 nm, yielding P JSI of 0.989, 0.983 and 0.958, respectively. Such a photon source is useful for quantum information and communication systems.

Spectrally Pure States at Telecommunications Wavelengths from Periodically PoledMTiOXO4(M=Jin1, Zhao2, Deng3 et al. 2016Phys. Rev. AppliedSelf Cite210150View full textAdd to dashboardCite

“…See Ref. [14] for more theoretical details of the spectral purity, and the simulation of the JSA for the PPKTP crystal. The same property is maintained by the four isomorph crystals studied here.…”

Efficient detection of an ultra-bright single-photon source using superconducting nanowire single-photon detectors

“…From the perspective of single-photon sources, the one based on a spontaneous parametric down-conversion (SPDC) process from a periodically poled KTiOPO 4 (PPKTP) crystal has been proved to be very promising in many experiments [12][13][14][15][16][17][18][19][20][21][22][23]. The PPKTP crystal has a high nonlinear efficiency and a high damage threshold.…”

“…At telecom wavelengths, the PPKTP crystal satisfies not only the quasi-phase matching condition, but also the group-velocity matching (GVM) condition [24,25]. The single-photon source from a GVM-PPKTP crystal may have a high spectral purity [12][13][14] and wide spectral tunability [20].…”

“…In all the previous experiments [12][13][14][15][16][17][18][19][20][21][22], however, this highly efficient photon source was detected by lowefficiency or low-speed detectors. For example, in Refs [12][13][14][15][16][17][18], the photons were detected by InGaAs APDs with less than or equal to 25% quantum efficiency; and in Refs [12,16], to match the low speed of the InGaAs APDs, the repetition rate of the pump laser was decreased from 76 MHz to around 4 MHz, so the performance of this source was not fully demonstrated.…”

Demonstration of spectral correlation control in a source of polarization-entangled photon pairs at telecom wavelength

“…© 2018 Optical Society of America OCIS codes: 190.4410,300.6190,270.4180,270.5565 Controlling the spectral correlations of a polarization entangled photon pair produced via spontaneous parametric down-conversion (SPDC) could have important benefits to applications in optical quantum information. Photonic quantum gates require pure states, which can be created by heralded sources producing pairs of spectrally decorrelated photons [1][2][3][4][5][6][7][8][9][10][11]. On the other hand, long distance fiber based quantum communication and quantum metrology [12,13] suffers from chromatic dispersion, which could potentially be improved [14] with positive spectral correlations [15][16][17].…”