Integrierte Mikroresonator-stabilisierte Lichtquellen für die (Quanten-)metrologie (iMiLQ)
|Staff members:||Oliver Neitzke, Florian Böhm|
Brilliance Fab Berlin GmbH (BFB)
Picoquant GmbH (PiQ)
Efficient and bright solid-state single photon sources are are of particular interest in order to build quantum information devices and to perform quantum cryptography experiments. Defect centers in diamond, most prominent the nitrogen-vacancy (NV) center, have been proven to be stable and bright single photon emitters, even at room temperature. The efficient and small-scale coupling of such a single emitter to a photonic device or a fiber network is an essential requirement to build complex quantum systems on a small scale without the need for bulky objectives.
In this joint project with the Ferdinand-Braun-Institut (FBH) and the two industrial partners Brilliance Fab Berlin GmbH (BFB) and Picoquant GmbH (PiQ), we are investigating a monolithic realized resonant single photon source. Starting point is research of the prior joint project AdMiRe (Advanced Micro-Resonators), which established a novel technology basis for SiO 2 microresonators, processed via standard semiconductor technology [Fig 1].
In the new enhanced system we want to integrate a SiO 2 waveguide and a toroidal microresonator on a chip and deterministic couple a single photon emitting diamond nanocrystal to the system via nanomanipulation. By resonant excitation of the defect center one can obtain a very narrow spectral emission window of emitted photons. The proposed system is capable of separation of excitation light from emitted photons to obtain a maximum amount of filtered single photons, even at resonant excitation. Additionally, due to the multiple ports of the device, analysis and stabilisation of the single-photon source could be achieved by fast statistical evaluation of the emitters single-photon
emission, measured with single-photon detectors.
This novel, monolithic single-photon source could be used as a source for new concepts in quantum information, quantum cryptography and radiometry. In particular it is interesting for applications in handheld or satellite systems due to its small size and simplicity.
|Fig. 1: Scanning electron micrograph of a silica microdisk with 25um radius, developed during AdMiRe.||Fig. 2: Optical microscope image of evanescently coupled light into a microdisc resonator via a tapered optical fibre.|
Fig. 3: Schematic of the proposed system with an integrated SiO2 waveguide and toroidal microresonator on a chip and a coupled single photon emitter (e.g. diamond nanocrystal with a defect center).
Dieses Projekt wurde kofinanziert durch den Europäischen Fonds für regionale Entwicklung (EFRE).