Coherence-protected Quantum Gate by Continuous Dynamical Decoupling in Diamond

TL;DR

This paper demonstrates an experimental method using continuous wave dynamical decoupling in nitrogen-vacancy centers to significantly extend coherence time and protect quantum gates, facilitating more reliable quantum information processing.

Contribution

The study introduces a practical protocol that prolongs coherence and protects quantum gates simultaneously, suitable for long-duration quantum control tasks.

Findings

Coherence time extended by about 20 times

Quantum gates protected during control duration

Compatible with quantum logic operations

Abstract

To implement reliable quantum information processing, quantum gates have to be protected together with the qubits from decoherence. Here we demonstrate experimentally on nitrogen-vacancy system that by using continuous wave dynamical decoupling method, not only the coherence time is prolonged by about 20 times, but also the quantum gates is protected for the duration of controlling time. This protocol shares the merits of retaining the superiority of prolonging the coherence time and at the same time easily combining with quantum logic tasks. It is expected to be useful in task where duration of quantum controlling exceeds far beyond the dephasing time.