Quantum state preparation by a shaped photon pulse in one-dimensional continuum

TL;DR

This paper introduces a method to deterministically prepare specific quantum states in a 1D continuum using shaped photon pulses, leveraging time-reversal of emission, effective even with environmental dissipation and imperfect shaping.

Contribution

The authors present a novel pulse-shaping technique for high-fidelity quantum state preparation in 1D systems, enabling entanglement creation with a single photon pulse.

Findings

High-fidelity preparation of Dicke and timed-Dicke states.

Generation of large quantum entanglement with a single photon.

Feasibility demonstrated in waveguide-QED and circuit-QED systems.

Abstract

We propose a method to deterministically prepare a desired quantum state in a one-dimensional (1D) continuum by a shaped photon pulse. This method is based on time-reverse of the quantum emission process. We show that the desired quantum state such as Dicke or timed-Dicke state can be successfully prepared with very high fidelity even if the dissipation to the environment is nonnegligible and the pulse shaping is not perfect. We also show that large quantum entanglement between emitters can be created by just a single photon pulse. This method is experimentally feasible in 1D waveguide-QED or circuit-QED system.