Exchange-Free Computation on an Unknown Qubit at a Distance

Hatim Salih*, Jonte R. Hance, Will McCutcheon, Terry Rudolph, John Rarity

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

15 Citations (Scopus)
143 Downloads (Pure)


We present a way of directly manipulating an arbitrary qubit, without the exchange of any particles. This includes as an application the exchange-free preparation of an arbitrary quantum state at Alice by a remote classical Bob. As a result, we are able to propose a protocol that allows one party to directly enact, by means of a suitable program, any computation exchange-free on a remote second party's unknown qubit. Further, we show how to use this for the exchange-free control of a universal two-qubit gate, thus opening the possibility of directly enacting any desired algorithm remotely on a programmable quantum circuit.
Original languageEnglish
Article number013004
Number of pages10
JournalNew Journal of Physics
Issue number1
Publication statusPublished - 19 Jan 2021

Bibliographical note

Funding Information:
We thank Claudio Marinelli for helping to bring this collaboration together. This work was supported by the Engineering and Physical Sciences Research Council (Grants EP/P510269/1, EP/T001011/1, EP/R513386/1, EP/M013472/1 and EP/L024020/1).

Publisher Copyright:
© 2021 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft

Structured keywords

  • QETLabs
  • Bristol Quantum Information Institute
  • Photonics and Quantum


  • quant-ph


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