Near-optimal Sources of Single Photons in Silicon Quantum Photonics based on Intermodal Spontaneous Four-Wave-Mixing (Student)
Alexandre Maïnos 1, Stefano Paesani 1, Massimo Borghi 2, Stefano Signorini 3,Lorenzo Pavesi 3, Anthony Laing 1 1Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS81FD, UK 2SM Optics S.R.L., Research Programs, Via John Fitzgerald Kennedy 2, 20871 Vimercate, Italy 3Department of Physics, University of Trento, Via Sommarive 14, 38123 Trento, Italy
We report on a scalable near-unity purity and highly indistinguishable single photon source with high heralding efficiency integrated in a CMOS-compatible SOI platform. This source exploits the dual-mode pumpdelayed excitation scheme  in a dispersion-engineered multi-mode waveguide through non-degenerate spontaneous four-wave-mixing. We experimentally demonstrate a spectral purity of 0:9904 0:0006, a mutual indistinguishability of 0:987 0:002 and an intrinsic heralding efficiency of > 90%. We finally measure a heralded two-photon quantum interference with an unprecedented visibility of 0:96 0:02 on chip. These results enable scaling quantum information processing with integrated photonics.
Keywords: Quantum, Photonics, Pure, Source, Intermodal, Spontaneous-four-wave-mixing
Silicon source providing multi-spectral photon pairs with high-quality entanglement
Dorian Oser1, Florent Mazeas2, Carlos Alonso-Ramos1, Xavier Le Roux1, Laurent Vivien1, S´ebastien Tanzilli2, ´ Eric Cassan1, Laurent Labont´e2
1Centre de Nanosciences et de Nanotechnologies, CNRS, Universi´e Paris-Sud, Universit´e Paris-Saclay, C2N, Palaiseau, France 2Universit´e Cˆote d’Azur, CNRS, Institut de physique de Nice, France
The silicon photonic platform has the ability of generating and manipulating individual quantum states on single chips. However, a major challenge is the on-chip rejection of the pump without affecting the pairs generated by the non-linear processes. We report the integration on a single substrate a photon-pair generator with a pump-rejection filter. It allowed us to generate photon pairs with near-perfect entanglement on 11 pairs of wavelength channels simultaneously, while achieving 85 dB of rejection of the pump. The frequency comb generated was at telecom wavelengths and compatible with the ITU channels spacing.
Keywords: ring resonator, photonics, SFWM, multimode, Bragg filters.
Monolithically integrated differential phase shift transmitter for quantum key distribution
H. O. Çirkinoglu1, R. Santos2, K.Williams1, X. Leijtens1 1 Eindhoven University of Technology, 5612 AZ, Eindhoven, The Netherlands 2 SMART Photonics, Eindhoven, The Netherlands
An integrated differential phase shift QKD transmitter, which consist of a distributed Bragg reflector laser, a phase modulator, and Mach-Zehnder modulator sections for pulse carving and optical attenuation has been designed and fabricated. Initial characterization shows single mode operation of the laser with a linewidth around 2 MHz, and an achievable optical attenuation of more than 60 dB.
Keywords: Photonic Integrated Circuits, Quantum Key Distribution