Entanglement of distinguishable quantum memories

TL;DR

This paper demonstrates a method to entangle distinguishable quantum memories emitting photons with different frequencies using time-resolved detection, crucial for future heterogeneous quantum networks.

Contribution

It experimentally shows entanglement of remote trapped ions via distinguishable photons, advancing modular quantum system development.

Findings

Successful entanglement of $^{171}$Yb$^+$ ions with distinguishable photons

No loss in entanglement rate or fidelity using the technique

Potential application in heterogeneous quantum networks

Abstract

Time-resolved photon detection can be used to generate entanglement between distinguishable photons. This technique can be extended to entangle quantum memories that emit photons with different frequencies and identical temporal profiles without the loss of entanglement rate or fidelity. We experimentally realize this process using remotely trapped $^{171}$Yb$^+$ ions where heralded entanglement is generated by interfering distinguishable photons. This technique may be necessary for future modular quantum systems and networks that are composed of heterogeneous qubits.