Robust dynamical decoupling with concatenated continuous driving

TL;DR

This paper introduces concatenated continuous dynamical decoupling, a method that significantly enhances coherence times in quantum systems by overcoming noise from external sources and driving field fluctuations, demonstrated experimentally on NV centers.

Contribution

The paper proposes and experimentally validates a novel concatenated continuous dynamical decoupling scheme that improves quantum coherence times beyond previous limits.

Findings

Achieves relaxation-limited coherence times.

Demonstrates an order of magnitude increase in decoherence time for NV centers.

Applicable to various quantum systems like trapped ions and quantum dots.

Abstract

The loss of coherence is one of the main obstacles for the implementation of quantum information processing. The efficiency of dynamical decoupling schemes, which have been introduced to address this problem, is limited itself by the fluctuations in the driving fields which will themselves introduce noise. We address this challenge by introducing the concept of concatenated continuous dynamical decoupling, which can overcome not only external magnetic noise but also noise due to fluctuations in driving fields. We show theoretically that this approach can achieve relaxation limited coherence times, and demonstrate experimentally that already the most basic implementation of this concept yields an order of magnitude improvement of the decoherence time for the electron spin of nitrogen vacancy centers in diamond. The proposed scheme can be applied to a wide variety of other physical systems including, trapped atoms and ions, quantum dots, and may be combined with other quantum technologies challenges such as quantum sensing and quantum information processing.