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TT: Fachverband Tiefe Temperaturen

TT 5: Transport: Quantum Coherence and Quantum Information Systems - Experiment
(Joint session of HL, MA and TT organized by TT)

TT 5.6: Vortrag

Montag, 7. März 2016, 11:00–11:15, H22

Displacement of squeezed propagating microwave states — •Kirill G. Fedorov¹, P. Yard^1,2, S. Pogorzalek^1,2, P. Eder^1,2,3, M. Fischer^1,2,3, J. Goetz^1,2, F. Wulschner^1,2, E. Xie^1,2,3, F. Deppe^1,2,3, A. Marx¹, and R. Gross^1,2,3 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — ²Physik-Department, Technische Universität München, 85748 Garching, Germany — ³Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 München, Germany

The displacement of propagating quantum states of light is a fundamental operation for quantum communication. It can be applied to fundamental studies of macroscopic quantum coherence and has an important role in quantum teleportation protocols with continuous variables. We study an experimental implementation of this operation for propagating squeezed microwave states. We generate these states using a Josephson parametric amplifier and implement the displacement operation using a specific cryogenic directional coupler. We demonstrate that even for strong displacement amplitudes we do not observe any degradation of the reconstructed quantum states. Furthermore, we confirm that path entanglement generated using displaced squeezed states, also stays constant over a wide range of the displacement power.

We acknowledge support by the German Research Foundation through SFB 631 and FE 1564/1-1, the EU project PROMISCE, and Elite Network of Bavaria through the program ExQM.