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TT: Fachverband Tiefe Temperaturen
TT 15: Quantum Coherence and Quantum Information Systems (joint session TT/DY)
TT 15.9: Talk
Tuesday, March 18, 2025, 12:00–12:15, H31
Secure squeezed state microwave quantum communication with spin ensembles (part 2) — •Patricia Oehrl1, 2, Florian Fesquet1, 2, Tahereh Parvini1, 2, 3, Maria-Teresa Handschuh1, 2, Kedar E. Honasoge1, 2, Achim Marx1, Nadezhda Kukharchyk1, 2, 3, Rudolf Gross1, 2, 3, Kirill G. Fedorov1, 2, 3, and Hans Huebl1, 2, 3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2School of Natural Sciences, Technical University of Munich, Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Munich, Germany
Solid-state spin ensembles offer exceptional coherence times at low temperatures and transition frequencies in the GHz range, which makes them ideal for interfacing with superconducting quantum circuits. Moreover, they are promising candidates for the storage of microwave quantum states, providing great potential for quantum memory and quantum sensing applications. Here, we investigate a phosphorus donor electron spin ensemble hosted in silicon. It is coupled to a superconducting microwave resonator and probed at millikelvin temperatures as well as moderate magnetic fields. We investigate the efficiency of photon absorption for coherent and squeezed microwave signals. To this end, we use continuous wave and pulsed electron spin resonance protocols. We verify our results with an input-output model of our hybrid system and discuss the storage efficiency of microwave signals.
We acknowledge financial support from the Federal Ministry of Education and Research of Germany (project number 16KISQ036).
Keywords: Spin ensemble; Electron spin resonance; Squeezed states; Quantum state storage; Quantum Sensing