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 journalArticlepeer-review

15 Citations (Scopus)
32 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
JournalNew Journal of Physics
Issue number1
Early online date19 Jan 2021
Publication statusPublished - Jan 2021


  • Counterfactual communication
  • Quantum algorithms
  • Quantum computation
  • Quantum information

ASJC Scopus subject areas

  • General Physics and Astronomy


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