Arbitrary control of multiple-qubit systems in the symmetric Dicke subspace

TL;DR

This paper presents a method for arbitrary control of multiple qubits within the symmetric Dicke subspace, enabling the creation of entangled states through selective transition manipulation, demonstrated in cavity QED systems.

Contribution

It introduces a general physical mechanism for controlling quantum states in the symmetric Dicke subspace, allowing for the creation of any entangled state from the ground state.

Findings

Control of quantum states via selective transition manipulation

Ability to generate any entangled state in the symmetric Dicke subspace

Applicable to cavity QED and potentially other systems

Abstract

We discuss a general physical mechanism for arbitrary control of the quantum states of multiple qubits in the symmetric Dicke subspace. The qubit-qubit coupling leads to unequal energy spacing in the symmetric Dicke subspace. This allows one to manipulate a prechosen transition with an external driving source, with other transitions remaining off-resonant. Any entangled state in the symmetric Dicke subspace can be created from the initial ground state by tuning the driving source. We illustrate the idea in cavity QED, but it should be applicable to other related systems.