A universal quantum rewinding protocol with an arbitrarily high probability of success

TL;DR

This paper introduces a universal quantum rewinding protocol that can restore any target qubit to its previous state with arbitrarily high probability, utilizing superposition of paths and interference effects.

Contribution

It presents a novel, universal quantum rewinding method applicable to any target qubit, achieving near-certain success regardless of uncharacterized quantum operations.

Findings

Achieves arbitrarily high success probability in quantum state reversal.

Works with uncharacterized, repeatable quantum operations.

Guarantees finite steps to reach the desired state.

Abstract

We present a universal mechanism that, acting on any target qubit, propagates it to the state it had T 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 system will reach the desired state with probability 1 after some finite number of steps.