Experimental aspects of indefinite causal order in quantum mechanics

Lee A. Rozema (Corresponding author), Teodor Strömberg, Huan Cao, Yu Guo, Bi Heng Liu, Philip Walther (Corresponding author)

Publications: Contribution to journalReviewPeer Reviewed

Abstract

In the past decade, the toolkit of quantum information has been expanded to include processes in which the basic operations do not have definite causal relations. Originally considered in the context of the unification of quantum mechanics and general relativity, these causally indefinite processes have been shown to offer advantages in a wide variety of quantum-information processing tasks, ranging from quantum computation to quantum metrology. Here, we overview these advantages and the experimental efforts to realize them. We survey both the experimental techniques employed and the theoretical methods developed in support of the experiments, before discussing the interpretations of current experimental results and giving an outlook on the future of the field.
Original languageEnglish
Pages (from-to)483–499
Number of pages17
JournalNature Reviews Physics
Volume6
Issue number8
DOIs
Publication statusPublished - Aug 2024

Austrian Fields of Science 2012

  • 103025 Quantum mechanics
  • 103026 Quantum optics

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