Photonic realization of quantum resetting

TL;DR

This paper demonstrates a photonic implementation of probabilistic quantum resetting, showing that an arbitrary quantum state can be reset to its past with high fidelity, even without control over the process.

Contribution

It provides the first experimental photonic realization of quantum resetting, verifying the process's effectiveness and preserving entanglement after resetting.

Findings

Achieved quantum state resetting with 87% fidelity.

Successfully preserved entanglement after resetting half of an entangled pair.

Verified violation of Bell inequality post-resetting.

Abstract

Contrary to the usual assumption of at least partial control of quantum dynamics, a surprising recent result proved that an arbitrary quantum state can be probabilistically reset to a state in the past by having it interact with probing systems in a consistent, but $uncontrolled$ way. We present a photonic implementation to achieve this resetting process, experimentally verifying that a state can be probabilistically reset to its past with a fidelity of $0.870\pm0.012$. We further demonstrate the preservation of an entangled state, which still violates a Bell inequality, after half of the entangled pair was reset. The ability to reset uncontrolled quantum states has implications in the foundations of quantum physics and applications in areas of quantum technology.