Abstract
We present a universal mechanism that, acting on any target qubit, propagates it to the state it had time units before the experiment started. This protocol works by setting the target on a superposition of flight paths, where it is acted on by uncharacterized, but repeatable, quantum operations. Independently of the effect of each of these individual operations on the target, the successful interference of the paths causes it to leap to its past state. We prove that, for generic interaction effects, the protocol will herald a successful rewinding with probability 1 after some finite number of steps.
- Received 5 April 2022
- Accepted 31 January 2023
DOI:https://doi.org/10.1103/PhysRevLett.130.110201
© 2023 American Physical Society
Physics Subject Headings (PhySH)
synopsis
Hitting Rewind on Quantum Processes
Published 14 March 2023
A new technique for reversing the evolution of a quantum system could become a key tool in quantum information technology.
See more in Physics