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

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.

Strong Correlation Between Superconductivity and Ferromagnetism in an Fe-Chalcogenide Superconductor

“…At the same time, our results also reveal the unconventional pairing mechanism and the time reversal symmetry breaking in FTS, demonstrating NV centers as a versatile local probe to investigate nanoscale electrical and magnetic properties of emergent quantum materials. The observed spatially tunable coupling between NV centers and superconducting FTS also provides a new route for developing hybrid quantum architectures, 43 aiding in the development of next-generation, solid-state-based quantum information technologies.…”

Quantum Engineering With Hybrid Magnonic Systems and Materials (Invited Paper)

“…8,[199][200][201] Over the past decade, extensive experimental and theoretical efforts have been devoted to realizing quantum networks, 10,202 registers, 203 and memories 204 in NV-based hybrid quantum systems. [205][206][207][208][209][210][211] The coupling between solid-state qubits and magnetic materials, in particular, underlies varied applications in quantum information science. 200,209,212 In the weak coupling regime, the sensitivity of single spin qubits to local magnetic fields provides a non-invasive, nanoscale probe of magnon physics over a wide range of temperatures.…”

“…234,235 For certain materials requiring epitaxial growth on specific substrates, patterned diamond nanostructures containing individual NV centers will be used and transferred onto the surface of samples. 9,211,[236][237][238] Thirdly, by employing scanning NV microscopy, 214,239 where a micrometersized diamond cantilever containing individual NV centers is attached to an atomic force microscope, the NVto-sample distance can be systematically controlled with nanoscale resolution.…”

Electric field control of interaction between magnons and quantum spin defects

“…To exploit the QSD-magnon hybrids it is critical to tune the interaction between magnons and QSDs locally and with minimal heating. Thus far, the control of magnon-QSD interaction has primarily been achieved via tuning an applied magnetic field 4, 7,19 and more recently by a currentinduced spin-orbit torque 27 . The control magnetic field is challenging to localize at the nanoscale, while the use of electric current causes Joule heating and thus negatively affects quantum coherence.…”