Experimental test of entangled histories

Jordan Cotler, Lu Ming Duan, Pan Yu Hou, Frank Wilczek, Da Xu, Zhang Qi Yin, Chong Zu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Entangled histories arise when a system partially decoheres in such a way that its past cannot be described by a sequence of states, but rather a superposition of sequences of states. Such entangled histories have not been previously observed. We propose and demonstrate the first experimental scheme to create entangled history states of the Greenberger–Horne–Zeilinger (GHZ) type. In our experiment, the polarization states of a single photon at three different times are prepared as a GHZ entangled history state. We define a GHZ functional which attains a maximum value 1 on the ideal GHZ entangled history state and is bounded above by 1∕16 for any three-time history state lacking tripartite entanglement. We have measured the GHZ functional on a state we have prepared experimentally, yielding a value of 0.656±0.005, clearly demonstrating the contribution of entangled histories.

Original languageEnglish (US)
Pages (from-to)334-347
Number of pages14
JournalAnnals of Physics
Volume387
DOIs
StatePublished - Dec 2017

Keywords

  • Consistent histories
  • Many worlds
  • Temporal entanglement

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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