Quantum state transfer in a quantum network: a quantum-optical implementation

John Rarity, Harald Weinfurter

S. J. van Enk, J. I. Cirac, P. Zoller +2 more

We propose a scheme to utilize photons for ideal quantum transmission between atoms located at spatially separated nodes of a quantum network. We also propose a method to correct errors during transmission.

Amy Navarathna, James S. Bennett, Warwick P. Bowen

Optical-to-mechanical quantum state transfer is an important capability for future quantum networks, quantum communication, and distributed quantum sensing. However, existing continuous state transfer protocols operate in the resolved sideband regime, necessitating a high-quality optical cavity and a high mechanical resonance frequency. Here, we propose a continuous protocol that operates in the unresolved sideband regime. The protocol is based on feedback cooling, can be implemented with current technology, and is able to transfer non-Gaussian quantum states with high fidelity. Our protocol significantly expands the kinds of optomechanical devices for which continuous optical-to-mechanical state transfer is possible, paving the way toward quantum technological applications and the preparation of macroscopic superpositions to test the fundamentals of quantum science.

J. D. Franson, T. B. Pittman

Seb J. Savory, M. Düser, Andrea Del Duce +2 more

He Hao, Lingxiao Shan, Qi Zhang +3 more

Abstract High‐fidelity quantum state transfer, lying in the heart of the scalable quantum network, requires the frequency linkage among different quantum elements. Here, a protocol of quantum state transfer with seamless frequency‐connection between the solid spin and phonon as well as between arbitrary frequency and telecom photons through the diamond optomechanical cavity is proposed. When the diamond optomechanical cavity acts as a quantum node of the network, within each node, the spin state can map to the phonon state with arbitrary frequency via the sideband transition between spins and phonons, and simultaneously such phonon state can convert to photon state without any frequency selection through optomechanical interaction. Furthermore, the communication among quantum nodes is implemented by the evanescent field of nanofiber. The scheme not only enables universal scalable quantum networks for using robust quantum spins, but also offers a paradigm of the building block for optical quantum communications.