Quantum key distribution without sending a quantum signal

Ralph, T. C. and Walk, N. (2015) Quantum key distribution without sending a quantum signal. New Journal of Physics, 17 6: 1-13. doi:10.1088/1367-2630/17/6/063008

Author Ralph, T. C.
Walk, N.
Title Quantum key distribution without sending a quantum signal
Journal name New Journal of Physics   Check publisher's open access policy
ISSN 1367-2630
Publication date 2015-06
Sub-type Article (original research)
DOI 10.1088/1367-2630/17/6/063008
Open Access Status DOI
Volume 17
Issue 6
Start page 1
End page 13
Total pages 13
Place of publication Institute of Physics Publishing
Publisher Bristol, United Kingdom
Collection year 2016
Language eng
Abstract Quantum Key Distribution is a quantum communication technique in which random numbers are encoded on quantum systems, usually photons, and sent from one party, Alice, to another, Bob. Using the data sent via the quantum signals, supplemented by classical communication, it is possible for Alice and Bob to share an unconditionally secure secret key. This is not possible if only classical signals are sent. While this last statement is a long standing result from quantum information theory it turns out only to be true in a non-relativistic setting. If relativistic quantum field theory is considered we show it is possible to distribute an unconditionally secure secret key without sending a quantum signal, instead harnessing the intrinsic entanglement between different regions of space–time. The protocol is practical in free space given horizon technology and might be testable in principle in the near term using microwave technology.
Keyword Quantum communication
Space-time entanglement
Relativistic quantum information
Flux qubit
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
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Citation counts: TR Web of Science Citation Count  Cited 1 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 1 times in Scopus Article | Citations
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