Measurement Induced Subradiance

TL;DR

This paper introduces a measurement-based protocol to prepare subradiant states in quantum emitters, enabling efficient state preparation without complex control or environment structuring.

Contribution

It proposes a universal measurement-driven method to generate subradiant states in quantum emitter ensembles, applicable across different platforms.

Findings

Single measurements can produce subradiant steady states in symmetric ensembles.

Repeated measurements on one emitter can drive the system into a subradiant Dicke state.

The protocol is platform-independent and does not require structured environments.

Abstract

Preparing subradiant steady states of collectively emitting quantum two-level emitters (TLEs) is hindered by their dark, weakly interacting nature. Existing approaches rely on patterned driving, local control, or structured environments. We propose a platform-independent protocol based on projective measurements on a single TLE. For permutation-symmetric ensembles, a single measurement yields appreciable occupation of single-excitation subradiant steady states. For generic arrays, repeated measurements on one emitter drive the unmeasured TLEs into a nearly pure state with large overlap with the subradiant Dicke subspace.