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TT: Fachverband Tiefe Temperaturen

TT 92: Quantum Dynamics, Decoherence and Quantum Information (joint session DY/TT)

TT 92.1: Vortrag

Freitag, 22. März 2024, 10:45–11:00, A 151

Photon-Resolved Floquet Theory and its Application to Quantum Communication — •Georg Engelhardt¹, Sayan Choudhury^2,3, W. Vincent Liu^2,1, JunYan Luo⁴, Victor M. Bastidas^5,6, 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