Universität zu Köln

Lam, Manolo R., Peter, Natalie, Groh, Thorsten ORCID: 0000-0001-7967-4523, Alt, Wolfgang, Robens, Carsten ORCID: 0000-0001-7180-7918, Meschede, Dieter, Negretti, Antonio ORCID: 0000-0002-4314-6902, Montangero, Simone ORCID: 0000-0002-8882-2169, Calarco, Tommaso ORCID: 0000-0001-5364-7316 and Alberti, Andrea ORCID: 0000-0002-1698-3895 (2021). Demonstration of Quantum Brachistochrones between Distant States of an Atom. Phys. Rev. X, 11 (1). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2160-3308

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Abstract

Transforming an initial quantum state into a target state through the fastest possible route-a quantum brachistochrone-is a fundamental challenge for many technologies based on quantum mechanics. In two-level systems, the quantum brachistochrone solutions are long known. These solutions, however, are not applicable to larger systems, especially when the target state cannot be reached through a local transformation. Here, we demonstrate fast coherent transport of an atomic wave packet over a distance of 15 times its size-a paradigmatic case of quantum processes going beyond the two-level system. Our measurements of the transport fidelity reveal the existence of a minimum duration-a quantum speed limit-for the coherent splitting and recombination of matter waves. We obtain physical insight into this limit by relying on a geometric interpretation of quantum state dynamics. These results shed light on a fundamental limit of quantum state dynamics and are expected to find relevant applications in quantum sensing and quantum computing.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lam, Manolo R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Peter, Natalie UNSPECIFIED UNSPECIFIED UNSPECIFIED Groh, Thorsten UNSPECIFIED orcid.org/0000-0001-7967-4523 UNSPECIFIED Alt, Wolfgang UNSPECIFIED UNSPECIFIED UNSPECIFIED Robens, Carsten UNSPECIFIED orcid.org/0000-0001-7180-7918 UNSPECIFIED Meschede, Dieter UNSPECIFIED UNSPECIFIED UNSPECIFIED Negretti, Antonio UNSPECIFIED orcid.org/0000-0002-4314-6902 UNSPECIFIED Montangero, Simone UNSPECIFIED orcid.org/0000-0002-8882-2169 UNSPECIFIED Calarco, Tommaso UNSPECIFIED orcid.org/0000-0001-5364-7316 UNSPECIFIED Alberti, Andrea UNSPECIFIED orcid.org/0000-0002-1698-3895 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-596903
DOI:	10.1103/PhysRevX.11.011035
Journal or Publication Title:	Phys. Rev. X
Volume:	11
Number:	1
Date:	2021
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2160-3308
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59690