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.

arXiv comment6 pages, 3 figures

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• Theoretical investigation of a spectrally pure-state generation from isomorphs of KDP crystal at near-infrared and telecom wavelengths
• Wave Function Engineering for Spectrally-Uncorrelated Biphotons in the Telecommunication Band based on a Machine-Learning Framework
• Numerical Investigation of Photon-Pair Generation in Periodically Poled MTiOXO4 (M = K, Rb, Cs; X = P, As)
• Quantum manipulation of biphoton spectral distributions in a 2D frequency space toward arbitrary shaping of a biphoton wave packet
• Spectrally uncorrelated biphotons generated from `the family of BBO crystal'
• Thermal effects of the quantum states generated from the isomorphs of PPKTP crystal
• 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