Journal
PHYSICAL REVIEW A
Volume 80, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.80.044302
Keywords
quantum entanglement; quantum gates; superconductivity
Categories
Funding
- United Kingdom EPSRC
- Royal Society and Wolfson Foundation
- National Research Foundation and Ministry of Education, in Singapore
- EPSRC [EP/G028427/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G028427/1, GR/S99297/02, GR/S99297/01] Funding Source: researchfish
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Recent work has argued that the concepts of entanglement and nonlocality must be taken seriously even in systems consisting of only a single particle. These treatments, however, are nonrelativistic, and, if single-particle entanglement is fundamental, it should also persist in a relativistic description. Here, we consider a spin-1/2 particle in a superposition of two different velocities as viewed by an observer in a relativistically boosted inertial frame and show that the entanglement between the two velocity modes survives right up to the speed of light. We also discuss how quantum gates could be implemented in this way and apply our results to the case of a superconductor. In particular, we show that an s-wave superconductor would have p-wave components for a boosted observer.
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