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TT: Fachverband Tiefe Temperaturen
TT 92: Quantum Dynamics, Decoherence and Quantum Information (joint session DY/TT)
TT 92.1: Talk
Friday, March 22, 2024, 10:45–11:00, A 151
Photon-Resolved Floquet Theory and its Application to Quantum Communication — •Georg Engelhardt1, Sayan Choudhury2,3, W. Vincent Liu2,1, JunYan Luo4, Victor M. Bastidas5,6, and Gloria Platero7 — 1Southern University of Science and Technology, Shenzhen, China — 2University of Pittsburgh, Pittsburgh, USA — 3Harish Chandra Research Institute, UttarPradesh, India — 4Zhejiang University of Science and Technology, Hangzhou, China — 5NTT Research, Sunnyvale, USA — 6Massachusetts Institute of Technology, Cambridge, USA — 7Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, Madrid, Spain
The semiclassical analysis of Floquet systems can not account for quantum-optical phenomena that rely on the quantized nature of light. Here, we go beyond the semiclassical description by unifying Floquet theory with quantum optics using the framework of Full-Counting Statistics. This formalism, which we dub 'Photon-resolved Floquet theory' (PRFT), is based on two-point tomographic measurements, instead of the two-point projective measurements used in standard Full-Counting Statistics [1,2]. The PRFT predicts the generation of macroscopic light-matter entanglement when atoms interact with multimode electromagnetic fields, thereby leading to complete decoherence in the Floquet-state basis. Employing the PRFT, we propose a quantum communication protocol that may outperform the state-of-art few-photon protocols by two orders of magnitude or better.
[1] G. Engelhardt et al., arXiv:2207.08558 [2] G. Engelhardt et al., arXiv:2311.01509
Keywords: Flouqet theory; Full-counting statistics; Quantum optics; Quantum control; Quantum communication