Spontaneous generation of phononic entanglement in quantum dark-soliton qubits

TL;DR

This paper demonstrates that entanglement between dark-soliton qubits in Bose-Einstein condensates can spontaneously form due to quantum fluctuations, with potential applications in matter-wave phononics for quantum information.

Contribution

It reveals the spontaneous generation of entanglement in dark-soliton qubits driven by quantum fluctuations and dissipation, highlighting their suitability for quantum information processing.

Findings

Entanglement spontaneously generated via quantum fluctuations.

Long-distance steady-state concurrence observed.

Dark-soliton qubits are promising for matter-wave quantum protocols.

Abstract

We show that entanglement between two solitary qubits in quasi-one-dimensional Bose-Einstein condensates can be spontaneously generated due to quantum fluctuations. Recently we have shown that dark solitons are an appealing platform for qubits thanks to their appreciable long lifetime. We investigate the spontaneous generation of entanglement between dark-soliton qubits in the dissipative process of spontaneous emission. By driving the qubits with the help of oscillating magnetic field gradients, we observe the formation of long distance steady-state concurrence. Our results suggest that dark-soliton qubits are good candidates for quantum information protocols based purely on matter-wave phononics.