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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Hybridization of superconducting flux qubits and diamond ensembles: a route to local gates for quantum repeaters

William J. Munro, Xiaobo Zhu, Yuichiro Matsuzaki, Ashley M. Stephens, Kae Nemoto, Shiro Saito

Published Sep 26, 2013• 0 citations
Publisher

Abstract

The development of quantum networks requires stable quantum bits with which we can process, store and transport quantum information. A significant bottleneck in their performance is the ability to perform reliable local gates. It is well known that superconducting flux qubits have excellent processing ability while electron-spin nitrogen-vacancy centers in diamond are a natural memory and optical interface. Hybridization of these two systems thus presents the promise of an effective and efficient way to perform local gates. Here we report on the first step towards this: quantum state transfer between these systems.

DOI
10.1117/12.2022602

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The development of quantum networks requires stable quantum bits with which we can process, store and transport quantum information. A significant bottleneck in their performance is the ability to perform reliable local gates. It is well known that superconducting flux qubits have excellent processing ability while electron-spin nitrogen-vacancy centers in diamond are a natural memory and optical interface. Hybridization of these two systems thus presents the promise of an effective and efficient way to perform local gates. Here we report on the first step towards this: quantum state transfer between these systems.
We have built a hybrid system composed of a superconducting flux qubit (the processor) and an ensemble of nitrogen-vacancy centers in diamond (the memory) that can be directly coupled to one another, and demonstrated how information can be transferred from the flux qubit to the memory, stored, and subsequently retrieved. We have established the coherence properties of the memory and succeeded in creating an entangled state between the processor and memory, demonstrating how the entangled state's coherence is preserved. Our results are a significant step towards using an electron spin ensemble as a quantum memory for superconducting qubits.
We propose a method to achieve coherent coupling between nitrogen-vacancy (NV) centers in diamond and superconducting (SC) flux qubits. The resulting coupling can be used to create a coherent interaction between the spin states of distant NV centers mediated by the flux qubit. Furthermore, the magnetic coupling can be used to achieve a coherent transfer of quantum information between the flux qubit and an ensemble of NV centers. This enables a long-term memory for a SC quantum processor and possibly an interface between SC qubits and light.
A hybrid system that combines the advantages of a superconductor flux qubit and an electron spin ensemble in diamond is one of the promising devices to realize quantum information processing. Exploring the properties of the superconductor diamond system is essential for the efficient use of this device. When we perform spectroscopy of this system, significant power broadening is observed. However, previous models to describe this system are known to be applicable only when the power broadening is negligible. Here, we construct a new approach to analyze this system with strong driving, and succeed in reproducing the spectrum with the power broadening. Our results provide an efficient way to analyze this hybrid system.
Nitrogen-vacancy (NV) centers in diamond and superconducting qubits are two promising solid-state quantum systems for quantum science and technology, but the realization of controlled interfaces between individual solid-state spins and superconducting qubits remains fundamentally challenging. Here, we propose and analyze a hybrid quantum system consisting of a magnetic skyrmion, an NV center, and a superconducting qubit, where the solid-state qubits are both positioned in proximity to the skyrmion structure in a thin magnetic disk. We show that it is experimentally feasible to achieve strong (coherent or dissipative) coupling between the NV center and the superconducting qubit by using the as an intermediary. This allows coherent information transfer and nonreciprocal responses between the NV center and the superconducting qubit at the single quantum level with high controllability. The proposed platform provides a scalable pathway for implementing quantum protocols that synergistically exploit the complementary advantages of spin-based quantum memories, microwave-frequency superconducting circuits, and topologically protected magnetic excitations.