Fully funable and switchable coupler for photon routing in quantum detection and modulation

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F19%3A73597124" target="_blank" >RIV/61989592:15310/19:73597124 - isvavai.cz</a>
Result on the web
<a href="https://www.osapublishing.org/ol/fulltext.cfm?uri=ol-44-23-5844&id=423697" target="_blank" >https://www.osapublishing.org/ol/fulltext.cfm?uri=ol-44-23-5844&id=423697</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1364/OL.44.005844" target="_blank" >10.1364/OL.44.005844</a>

Result language
angličtina
Original language name
Fully funable and switchable coupler for photon routing in quantum detection and modulation
Original language description
Photonic routing is a key building block of many optical applications challenging its development. We report a 2 x 2 photonic coupler with a splitting ratio switchable by a low-voltage electronic signal with 10 GHz bandwidth and tens of nanoseconds latency. The coupler can operate at any splitting ratio ranging from 0:100 to 100:0 with the extinction ratio of 26 dB in optical bandwidth of 1.3 THz. We show sub-nanosecond switching between arbitrary coupling regimes including a balanced 50:50 beam splitter, 0:100 switch, and a photonic tap. The core of the device is based on a Mach-Zehnder interferometer in a dual-wavelength configuration allowing real-time phase lock with long-term sub-degree stability at single-photon level. Using the reported coupler, we demonstrate for the first time, to the best of our knowledge, a perfectly balanced time-multiplexed device for photon-number-resolving detectors and also the active preparation of a photonic temporal qudit state up to four time bins. Verified long-term stable operation of the coupler at the single-photon level makes it suitable for a wide application range in quantum information processing and quantum optics in general.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10306 - Optics (including laser optics and quantum optics)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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