Atomic interactions for qubit-error compensations

TL;DR

This paper introduces a method to correct phase and population errors in quantum systems by utilizing interactions between a target qubit and an auxiliary control qubit, effective for single-photon and two-photon excitation schemes.

Contribution

It proposes a novel approach for unitary error compensation in quantum systems using qubit interactions, applicable to different excitation schemes and models.

Findings

Effective error compensation in single-photon excitation schemes.

Comparable efficiency of double-STIRAP process for two-photon schemes.

Successful correction of phase and population errors in tested models.

Abstract

Experimental imperfections induce phase and population errors in quantum systems. We present a method to compensate unitary errors affecting also the population of the qubit states. This is achieved through the interaction of the target qubit with an additional control qubit. We show that our approach works well for single-photon and two-photon excitation schemes. In the first case, we study two reduced models (i) a two-level system in which the interaction corresponds to an effective level shift and (ii) a three-level one describing two qubits in the Bell triplet subspace. In the second case, instead, a double-STIRAP process is presented with comparable compensation efficiency with respect to the single-photon case.