Bootstrap tomography of high-precision pulses for quantum control

TL;DR

This paper introduces a novel protocol for analyzing and correcting high-precision control pulses in quantum systems, enabling better quantum control and error mitigation in solid-state qubits.

Contribution

The paper presents a bootstrap tomography protocol for pulse error analysis tailored for solid-state electron spins, verified experimentally with NV centers.

Findings

Protocol successfully characterizes pulse errors in NV centers.

Experimental verification confirms protocol's effectiveness.

Improves quantum control accuracy in solid-state qubits.

Abstract

Long-time dynamical decoupling and quantum control of qubits require high-precision control pulses. Full characterization (quantum tomography) of imperfect pulses presents a bootstrap problem: tomography requires initial states of a qubit which can not be prepared without imperfect pulses. We present a protocol for pulse error analysis, specifically tailored for a wide range of the single solid-state electron spins. Using a single electron spin of a nitrogen-vacancy (NV) center in diamond, we experimentally verify the correctness of the protocol, and demonstrate its usefulness for quantum control tasks.