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Quantum Network Nodes Based on Diamond Qubits with an Efficient Nanophotonic Interface.

C T Nguyen¹, D D Sukachev¹, M K Bhaskar¹

¹Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters

|November 26, 2019

Summary

This summary is machine-generated.

Researchers developed a diamond nanocavity with a silicon-vacancy (SiV) center for quantum networks. This system enables efficient photon-spin interfaces and quantum memory, advancing quantum repeater technology.

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Area of Science:

Quantum Information Science
Solid-State Physics
Optics

Background:

Quantum networks require functional nodes for quantum processing and storage.
Efficient interfaces between stationary quantum registers and photons are crucial for quantum communication.

Purpose of the Study:

To demonstrate a functional node for quantum networks using a diamond nanocavity with an embedded silicon-vacancy (SiV) color center.
To achieve high-fidelity quantum processing and storage with efficient photon interfacing.

Main Methods:

Utilizing a diamond nanocavity with an embedded SiV color center coupled to a proximal nuclear spin.
Achieving efficient SiV-cavity coupling (cooperativity C>30) for photon-spin interface.
Employing coherent microwave control for quantum operations.

Main Results:

Demonstrated a nearly deterministic interface between photons and the SiV electron spin memory with coherence times exceeding 1 ms.
Showcased heralded single photon storage in the long-lived spin memory.
Achieved universal control over a cavity-coupled two-qubit register (SiV and 13C nuclear spin) with second-long coherence.

Conclusions:

The developed system represents a significant step towards realizing functional quantum network nodes.
The high-fidelity quantum operations and long coherence times lay the groundwork for implementing quantum repeaters.