Verification of a resetting protocol for an uncontrolled superconducting qubit

TL;DR

This paper experimentally verifies a quantum resetting protocol using superconducting qubits, achieving high fidelity and demonstrating its feasibility for controlling quantum system evolution with current technology.

Contribution

First experimental implementation of the $ ext{W}_4$ quantum resetting protocol with superconducting qubits, confirming its practicality and robustness across various interactions.

Findings

Reset state fidelity reached 0.951

Process fidelity was 0.792

Average success probability around 0.3 for unknown interactions

Abstract

Quantum resetting protocols allow a quantum system to be sent to a state in the past by making it interact with quantum probes when neither the free evolution of the system nor the interaction is controlled. We experimentally verify the simplest non-trivial case of a quantum resetting protocol, known as the $\mathcal{W}_4$ protocol, with five superconducting qubits, testing it with different types of free evolutions and target-probe interactions. After projection, we obtained a reset state fidelity as high as $0.951$, and the process fidelity was found to be $0.792$. We also implemented 100 randomly-chosen interactions and demonstrated an average success probability of $0.323$ for $|1\rangle$ and $0.292$ for $|-\rangle$, experimentally confirmed the nonzero probability of success for unknown interactions; the numerical simulated values are about $0.3$. Our experiment shows that the simplest quantum resetting protocol can be implemented with current technologies, making such protocols a valuable tool in the eternal fight against unwanted evolution in quantum systems.