Spectrally pure states at telecommunications wavelengths from periodically poled $M$TiO$X$O${}_4$ ($M$ = K, Rb, Cs; $X$ = P, As) crystals

Abstract

Significant successes have recently been reported in the study of the generation of spectrally pure state in group-velocity-matched (GVM) nonlinear crystals. However, the GVM condition can only be realized in limited kinds of crystals and at limited wavelengths. Here, we investigate pure state generation in the isomorphs of PPKTP crystal: i.e., periodically poled RTP, KTA, RTA and CTA crystals. By numerical simulation, we find that these crystals from the KTP family can generate pure photons with high spectral purity (over 0.8), wide tunability (more than 400 nm), reasonable nonlinearity at a variety of wavelengths (from 1300 nm to 2100 nm). It is also discovered that the PPCTA crystal may achieve purity of 0.97 at 1506 nm. This study may provide more and better choices for quantum state engineering at telecom wavelengths.

6 pages, 3 figures

References in corpus (7)

• Heralded Generation of Ultrafast Single Photons in Pure Quantum States
• A bright, pulsed two-mode squeezer
• Bright source of spectrally uncorrelated polarization-entangled photons with nearly single-mode emission
• Widely tunable single photon source with high purity at telecom wavelength
• Pulsed source of spectrally uncorrelated and indistinguishable photons at telecom wavelengths
• High-visibility nonclassical interference between pure heralded single photons and weak coherent photons
• Down-conversion source of positively spectrally correlated and decorrelated photon pairs at telecom wavelength

Cited by in corpus (5)

• Numerical Investigation of Photon-Pair Generation in Periodically Poled MTiOXO4 (M = K, Rb, Cs; X = P, As)
• Counter-propagating spectrally uncorrelated biphotons at 1550 nm generated from periodically poled MTiOXO4 (M = K, Rb, Cs; X = P, As)
• Monotonic quantum-to-classical transition enabled by positively-correlated biphotons
• Mid-infrared spectrally-pure single-photon states generation from 22 nonlinear optical crystals
• Terahertz waves generation using the isomorphs of PPKTP crystal: a theoretical investigation