Implementing general measurements on linear optical and solid-state qubits

TL;DR

This paper presents a systematic, feasible method for implementing general quantum measurements on single qubits using linear optical components and extends the approach to solid-state qubits, enabling versatile measurement capabilities.

Contribution

It introduces a practical construction for general measurements on single qubits with linear optics and proposes a method for solid-state qubits, broadening measurement techniques.

Findings

Feasible implementation of general measurements with beam splitters and wave plates.

Control of measurement parameters via linear optical elements.

Extension of measurement methods to solid-state qubits.

Abstract

We show a systematic construction for implementing general measurements on a single qubit, including both strong (or projection) and weak measurements. We mainly focus on linear optical qubits. The present approach is composed of simple and feasible elements, i.e., beam splitters, wave plates, and polarizing beam splitters. We show how the parameters characterizing the measurement operators are controlled by the linear optical elements. We also propose a method for the implementation of general measurements in solid-state qubits.