Towards the speed limit of high fidelity 2-qubit gates

TL;DR

This paper introduces a novel method to perform high-fidelity 2-qubit gates without time-dependent control fields, aiming to maximize speed and minimize errors, demonstrated experimentally in a nitrogen-vacancy center in diamond.

Contribution

The paper presents a new approach to eliminate control fields for specific quantum gates, enhancing speed and fidelity in quantum operations.

Findings

Successful experimental demonstration in NV center.

Potential for faster, error-resistant quantum gates.

Elimination of control fields reduces implementation complexity.

Abstract

Most implementations of quantum gate operations rely on external control fields to drive the evolution of the quantum system. Generating these control fields requires significant efforts to design the suitable control Hamiltonians. Furthermore, any error in the control fields reduces the fidelity of the implemented control operation with respect to the ideal target operation. Achieving sufficiently fast gate operations at low error rates remains therefore a huge challenge. In this work, we present a novel approach to overcome this challenge by eliminating, for specific gate operations, the time-dependent control fields entirely. This approach appears useful for maximising the speed of the gate operation while simultaneously eliminating relevant sources of errors. We present an experimental demonstration of the concept in a single nitrogen-vacancy (NV) center in diamond at room temperature.