Estimation of Spin-Spin Interaction by Weak Measurement Scheme

TL;DR

This paper introduces a weak measurement-based scheme to experimentally estimate spin-spin interactions in two-qubit systems, demonstrated through nitrogen vacancy centers in diamond, advancing quantum process tomography techniques.

Contribution

The paper presents a novel weak measurement scheme for evaluating spin-spin interactions, linking it to quantum process tomography and validating it with numerical simulations.

Findings

Successful numerical confirmation of the scheme in NV centers

Weak measurement can serve as a practical quantum process tomography method

Provides a new approach for characterizing two-qubit interactions

Abstract

Precisely knowing an interaction Hamiltonian is crucial to realize quantum information tasks, especially to experimentally demonstrate a quantum computer and a quantum memory. We propose a scheme to experimentally evaluate the spin-spin interaction for a two-qubit system by the weak measurement technique initiated by Yakir Aharonov and his colleagues. Furthermore, we numerically confirm our proposed scheme in a specific system of a nitrogen vacancy center in diamond. This means that the weak measurement can also be taken as a concrete example of the quantum process tomography.