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Q: Fachverband Quantenoptik und Photonik
Q 4: Quantum Information (Concepts and Methods) I
Q 4.7: Vortrag
Montag, 14. März 2022, 15:30–15:45, Q-H12
Broadband detection of a 200 MHz squeezing comb — •Dennis Wilken1,2, Jonas Junker1,2, and Michèle Heurs1,2 — 1Institut für Gravitationsphysik, Leibniz Universität Hannover, Germany — 2Max-Planck Institut für Gravitationsphysik, Hannover, Germany
Non-classical continuous-variable states such as squeezed vacua are promising resources in the field of quantum information. One common technique to generate such states relies on optical parametric oscillators, which produce squeezed states in a frequency comb structure. These combs usually have two limitations: first, the tooth separation (free-spectral range) is often larger than GHz, strongly limiting the number of accessible sidebands. Second, only one frequency can be measured at a given time. Here, we present a broadband measurement of our 200 MHz squeezing comb allowing simultaneous access to 18 sidebands. We have detected more than 9 dB of squeezing at a frequency of 3.6 GHz. To achieve this, we have designed a GHz photodetector with close to unity quantum efficiency. It turned out that a balanced detection scheme was not feasible. Therefore, our homodyne detection is based on a 99:1 beam splitter. Our method significantly simplifies the detection process and allows the simultaneous measurement of multiple squeezed states at different frequencies. This flexibility makes our approach an ideal cornerstone on the way to quantum computation with frequency encoded continuous-variable cluster states.