Complementary sequential measurements generate entanglement

Patrick J. Coles, Marco Piani

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22 Citations (Scopus)
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We present a paradigm for capturing the complementarity of two observables. It is based on the entanglement created by the interaction between the system observed and the two measurement devices used to measure the observables sequentially. Our main result is a lower bound on this entanglement and resembles well-known entropic uncertainty relations. Besides its fundamental interest, this result directly bounds the effectiveness of sequential bipartite operations—corresponding to the measurement interactions—for entanglement generation. We further discuss the intimate connection of our result with two primitives of information processing, namely, decoupling and coherent teleportation.
Original languageEnglish
Article number010302(R)
Number of pages5
JournalPhysical Review A
Publication statusPublished - 21 Jan 2014


  • sequential measurements
  • entanglement
  • entanglement generation

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