Electrical control of coherent spin rotation of a single-spin qubit

Xiaoche Wang,Nathan J Mclaughlin,Yuxuan Xiao,Chuanpu Liu,Eric E Fullerton,Hailong Wang,Mingzhong Wu,Eric Lee-Wong,Hanfeng Wang,Chunhui Rita Du

doi:10.1038/s41534-020-00308-8

Xiaoche Wang, Nathan J Mclaughlin + Show 8 more

Open Access

https://doi.org/10.1038/s41534-020-00308-8

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Abstract

Nitrogen vacancy (NV) centers, optically active atomic defects in diamond, have attracted tremendous interest for quantum sensing, network, and computing applications due to their excellent quantum coherence and remarkable versatility in a real, ambient environment. One of the critical challenges to develop NV-based quantum operation platforms results from the difficulty in locally addressing the quantum spin states of individual NV spins in a scalable, energy-efficient manner. Here, we report electrical control of the coherent spin rotation rate of a single-spin qubit in NV-magnet based hybrid quantum systems. By utilizing electrically generated spin currents, we are able to achieve efficient tuning of magnetic damping and the amplitude of the dipole fields generated by a micrometer-sized resonant magnet, enabling electrical control of the Rabi oscillation frequency of NV spins. Our results highlight the potential of NV centers in designing functional hybrid solid-state systems for next-generation quantum-information technologies. The demonstrated coupling between the NV centers and the propagating spin waves harbored by a magnetic insulator further points to the possibility to establish macroscale entanglement between distant spin qubits.

Highlights

The past decade witnessed significant progress in new approaches for information processing, such as quantum[1], neuromorphic[2,3], and non-von Neumann computing[4]
By utilizing the spinorbit torque (SOT) generated by an adjacent platinum (Pt) layer[24,25,26], we further demonstrated an efficient tuning of the magnetic damping of the resonant spin waves, enabling electrical control of spin rotation of a single-spin quantum qubit
We note that the mutual interactions between spin currents, magnetic devices, and NV spin qubits could be controlled in a scalable fashion down to a nanoscale regime, offering a new route to develop NV-based hybrid quantum computing platforms

Summary

INTRODUCTION

The past decade witnessed significant progress in new approaches for information processing, such as quantum[1], neuromorphic[2,3], and non-von Neumann computing[4]. Nitrogen-vacancy (NV) centers[9], optically active atomic defects in diamond that act as single-spin quantum bits, are naturally relevant in this context Due to their excellent quantum coherence time[9], local spin-entanglement[10], and notable versatility in a wide temperature range[11,12], NV centers offer a remarkable platform to design emerging quantum architectures[13,14,15]. The dispersive Oersted fields slowly decay in real space, which imposes an inherent challenge to achieve scalability in NV-based quantum operation systems This approach typically requires a high microwave current density and the associated Joule heat can lead to decoherence of the quantum spin states[19]. We note that the mutual interactions between spin currents, magnetic devices, and NV spin qubits could be controlled in a scalable fashion down to a nanoscale regime, offering a new route to develop NV-based hybrid quantum computing platforms

RESULTS

Wang et al 2

DISCUSSION

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