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dc.contributor.authorWei, Kejin
dc.contributor.authorTischler, Nora
dc.contributor.authorZhao, Si-Ran
dc.contributor.authorLi, Yu-Huai
dc.contributor.authorArrazola, Juan Miguel
dc.contributor.authorLiu, Yang
dc.contributor.authorZhang, Weijun
dc.contributor.authorLi, Hao
dc.contributor.authorYou, Lixing
dc.contributor.authorWang, Zhen
dc.contributor.authorChen, Yu-Ao
dc.contributor.authorSanders, Barry C
dc.contributor.authorZhang, Qiang
dc.contributor.authorPryde, Geoff J
dc.contributor.authorXu, Feihu
dc.contributor.authorPan, Jian-Wei
dc.date.accessioned2019-07-04T12:37:47Z
dc.date.available2019-07-04T12:37:47Z
dc.date.issued2019
dc.identifier.issn0031-9007
dc.identifier.doi10.1103/PhysRevLett.122.120504
dc.identifier.urihttp://hdl.handle.net/10072/384472
dc.description.abstractFinding exponential separation between quantum and classical information tasks is like striking gold in quantum information research. Such an advantage is believed to hold for quantum computing but is proven for quantum communication complexity. Recently, a novel quantum resource called the quantum switch—which creates a coherent superposition of the causal order of events, known as quantum causality—has been harnessed theoretically in a new protocol providing provable exponential separation. We experimentally demonstrate such an advantage by realizing a superposition of communication directions for a two-party distributed computation. Our photonic demonstration employs d-dimensional quantum systems, qudits, up to d=2 13 dimensions and demonstrates a communication complexity advantage, requiring less than (0.696±0.006) times the communication of any causally ordered protocol. These results elucidate the crucial role of the coherence of communication direction in achieving the exponential separation for the one-way processing task, and open a new path for experimentally exploring the fundamentals and applications of advanced features of indefinite causal structures.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherAMER PHYSICAL SOC
dc.relation.ispartofissue12
dc.relation.ispartofjournalPHYSICAL REVIEW LETTERS
dc.relation.ispartofvolume122
dc.subject.fieldofresearchPhysical Sciences
dc.subject.fieldofresearchMathematical Sciences
dc.subject.fieldofresearchEngineering
dc.subject.fieldofresearchcode02
dc.subject.fieldofresearchcode01
dc.subject.fieldofresearchcode09
dc.titleExperimental Quantum Switching for Exponentially Superior Quantum Communication Complexity
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 2019 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
gro.hasfulltextFull Text
gro.griffith.authorPryde, Geoff
gro.griffith.authorTischler, Nora


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