Generation of Total Angular Momentum Eigenstates in Remote Qubits

TL;DR

This paper presents a feasible optical scheme to generate any total angular momentum eigenstate of N remote, noninteracting qubits by entangling their ground states through photon measurements.

Contribution

It introduces a universal, experimentally feasible method to produce all symmetric and nonsymmetric angular momentum eigenstates of remote qubits using linear optics.

Findings

Scheme can generate any of the 2^N total angular momentum eigenstates.

Uses only linear optical tools and measurements.

Applicable to N remote, noninteracting qubits.

Abstract

We propose a scheme enabling the universal coupling of angular momentum of $N$ remote noninteracting qubits using linear optical tools only. Our system consists of $N$ single-photon emitters in a $\Lambda$-configuration that are entangled among their long-lived ground-state qubits through suitably designed measurements of the emitted photons. In this manner, we present an experimentally feasible algorithm that is able to generate any of the $2^N$ symmetric and nonsymmetric total angular momentum eigenstates spanning the Hilbert space of the $N$-qubit compound.