Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 8: Quantum Information (Concepts and Methods) II
Q 8.6: Talk
Monday, March 9, 2020, 15:15–15:30, e001
Quantum tetrachotomous states in phase space — •Namrata Shukla1, Naeem Akhtar2, and Barry C. Sanders2,3 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2University of Science and Technology, Shanghai, China — 3Institute for Quantum Science and Technology, University of Calgary, Calgary, Canada
The well-studied quantum optical Schrödinger's cat state is a superposition of two distinguishable states, with quantum coherence between these macroscopically distinguishable states being of foundational and, in the context of quantum-information processing, practical use. We refer to these quantum-optical cat states as quantum dichotomous states, reflecting that the state is a superposition of two options, and we introduce the term quantum multichotomous state to refer to a superposition of multiple macroscopically distinguishable options. For a single degree of freedom, such as position, we construct the quantum multichotomous states as a superposition of Gaussian states on the position line in phase space. Using this nomenclature, a quantum tetrachotomous state (QTS) is a coherent superposition of four macroscopically distinguishable states. We define, analyze, and show how to create such states, and our focus on the QTSs is due to their exhibition of much richer phenomena than for the quantum dichotomous states. Our characterization of the QTS involves the Wigner function, its marginal distributions, and the photon-number distribution, and we discuss the QTS's approximate realization in a multiple-coupled-well system.