Related papers: Coupling 4H-Silicon Carbide spins to a microwave resonator at milli-Kelvin temperature

Coupling 4H-Silicon Carbide spins to a microwave resonator at milli-Kelvin temperature

URL: http://arxiv.org/abs/2509.14840v1
Date: Thu, 18 Sep 2025 11:03:08 GMT
Title: Coupling 4H-Silicon Carbide spins to a microwave resonator at milli-Kelvin temperature
Authors: Ali Fawaz, Jeremy Bourhill, Stefania Castelletto, Hiroshi Abe, Takeshi Ohshima, Michael Tobar, Thomas Volz, Maxim Goryachev, Sarath Raman Nair,
Abstract summary: Coupling microwave cavity modes with spin qubit transitions is crucial for enabling efficient qubit readout and control.<n>We experimentally observe the coupling of different spin qubit transitions in Silicon Carbide (SiC) material to a 3D microwave (MW resonator mode around 12.6GHz at a temperature of 10mK.
Score: 0.2347592537884812
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Coupling microwave cavity modes with spin qubit transitions is crucial for enabling efficient qubit readout and control, long-distance qubit coupling, quantum memory implementation, and entanglement generation. We experimentally observe the coupling of different spin qubit transitions in Silicon Carbide (SiC) material to a 3D microwave (MW resonator mode around 12.6~GHz at a temperature of 10~mK. Tuning the spin resonances across the cavity resonance via magnetic-field sweeps, we perform MW cavity transmission measurements. We observe spin transitions of different spin defects that are detuned from each other by around 60-70~MHz. By optically exciting the SiC sample placed in the MW cavity with an 810~nm laser, we observe the coupling of an additional spin resonance to the MW cavity, also detuned by around 60-70 MHz from the centre resonance. We perform complementary confocal optical spectroscopy as a function of temperature from 4~K to 200~K. Combining the confocal spectroscopy results and a detailed analysis of the MW-resonator-based experiments, we attribute the spin resonances to three different paramagnetic defects: positively-charged carbon antisite vacancy pair (CAV$^+$), and the negatively-charged silicon vacancy spins located at two different lattice sites, namely V$_1$ and V$_2$ spins. The V$_1$ and V$_2$ lines in SiC are interesting qubit transitions since they are known to be robust to decoherence. Additionally, the CAV$^+$-transition is known to be a bright single-photon source. Consequently, the demonstration of the joint coupling of these spin qubits to a MW cavity mode could lead to interesting new modalities: The microwave cavity could act as an information bus and mediate long-range coupling between the spins, with potential applications in quantum computing and quantum communication, which is an attractive proposition in a CMOS-compatible material such as SiC.

Related papers

Bose condensation and Bogoliubov excitation in resonator-embedded superconducting qubit network [53.72731614116211]
Superconducting qubit networks (SQNs) embedded in a low-dissipative resonator are a promising device.<n>A quantum ac Stark effect provides by coupling between an SQN and microwave photons of a resonator, leads to a strong nonlinear interaction between photons.
arXiv Detail & Related papers (2026-01-21T15:43:43Z)
Spin-Photon Correlations from a Purcell-enhanced Diamond Nitrogen-Vacancy Center Coupled to an Open Microcavity [0.0]
An efficient interface between a spin qubit and single photons is a key enabling system for quantum science and technology.<n>We report on a coherently controlled diamond nitrogen-vacancy center electron spin qubit interfaced with an open microcavity.<n>We generate two-qubit and three-qubit spin-photon states and measure heralded Z-basis correlations between the photonic time-bin qubits and the spin qubit.
arXiv Detail & Related papers (2025-06-25T18:00:02Z)
Control and Transient Spectroscopy of Engineered Spin-Cavity Back-Action [0.0]
We present an experimental arrangement that permits engineering of cavity back-action on a mesoscopic spin ensemble.<n>By coupling a superconducting thin-film Nb microstrip resonator to a Trityl OX63 electron spin sample, we access different regimes of spin-cavity dynamics.
arXiv Detail & Related papers (2025-04-07T14:36:45Z)
Coherence of a hole spin flopping-mode qubit in a circuit quantum electrodynamics environment [0.0]
We present a FM hole spin qubit in a silicon nanowire coupled to a high-impedance niobium nitride microwave resonator for readout.<n>We report Rabi frequencies exceeding 100 MHz and coherence times in the microsecond range, resulting in a high single gate quality factor of 380.<n>We reveal for the first time that photonic effects predominantly limit coherence, with radiative decay being the main relaxation channel and photon shot-noise inducing dephasing.
arXiv Detail & Related papers (2025-03-13T18:26:59Z)
A New Bite Into Dark Matter with the SNSPD-Based QROCODILE Experiment [55.46105000075592]
We present the first results from the Quantum Resolution-d Cryogenic Observatory for Dark matter Incident at Low Energy (QROCODILE)<n>The QROCODILE experiment uses a microwire-based superconducting nanowire single-photon detector (SNSPD) as a target and sensor for dark matter scattering and absorption.<n>We report new world-leading constraints on the interactions of sub-MeV dark matter particles with masses as low as 30 keV.
arXiv Detail & Related papers (2024-12-20T19:00:00Z)
Coherence of a field-gradient-driven singlet-triplet qubit coupled to many-electron spin states in 28Si/SiGe [0.0]
Engineered spin-electric coupling enables spin qubits in semiconductor nanostructures to be manipulated efficiently and addressed individually. We demonstrate fast singlet-triplet qubit oscillation in a gate-defined double quantum dot in $28$Si/SiGe with an on-chip micromagnet. We present evidence of sizable and coherent coupling of the qubit with the spin states of a nearby quantum dot, demonstrating that appropriate spin-electric coupling may enable a charge-based two-qubit gate in a (1,1) charge configuration.
arXiv Detail & Related papers (2023-10-19T09:20:15Z)
Demonstration of electron-nuclear decoupling at a spin clock transition [54.088309058031705]
Clock transitions protect molecular spin qubits from magnetic noise. linear coupling to nuclear degrees of freedom causes a modulation and decay of electronic coherence. An absence of quantum information leakage to the nuclear bath provides opportunities to characterize other decoherence sources.
arXiv Detail & Related papers (2021-06-09T16:23:47Z)
Anisotropic electron-nuclear interactions in a rotating quantum spin bath [55.41644538483948]
Spin-bath interactions are strongly anisotropic, and rapid physical rotation has long been used in solid-state nuclear magnetic resonance. We show that the interaction between electron spins of nitrogen-vacancy centers and a bath of $13$C nuclear spins introduces decoherence into the system. Our findings offer new insights into the use of physical rotation for quantum control with implications for quantum systems having motional and rotational degrees of freedom that are not fixed.
arXiv Detail & Related papers (2021-05-16T06:15:00Z)
Controlled coherent dynamics of [VO(TPP)], a prototype molecular nuclear qudit with an electronic ancilla [50.002949299918136]
We show that [VO(TPP)] (vanadyl tetraphenylporphyrinate) is a promising system suitable to implement quantum computation algorithms. It embeds an electronic spin 1/2 coupled through hyperfine interaction to a nuclear spin 7/2, both characterized by remarkable coherence.
arXiv Detail & Related papers (2021-03-15T21:38:41Z)
Chemical tuning of spin clock transitions in molecular monomers based on nuclear spin-free Ni(II) [52.259804540075514]
We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes. The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments. The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
arXiv Detail & Related papers (2021-03-04T13:31:40Z)
Photon Condensation and Enhanced Magnetism in Cavity QED [68.8204255655161]
A system of magnetic molecules coupled to microwave cavities undergoes the equilibrium superradiant phase transition. The effect of the coupling is first illustrated by the vacuum-induced ferromagnetic order in a quantum Ising model. A transmission experiment is shown to resolve the transition, measuring the quantum electrodynamical control of magnetism.
arXiv Detail & Related papers (2020-11-07T11:18:24Z)
Room Temperature Coherent Control of Spin Defects in hexagonal Boron Nitride [0.0]
Optically active defects in solids with accessible spin states are promising candidates for solid state quantum information and sensing applications. We realize coherent control of ensembles of boron vacancy centers in hexagonal boron nitride (hBN) Our results are important for employment of van der Waals materials for quantum technologies.
arXiv Detail & Related papers (2020-10-23T16:31:37Z)
Local vibrational modes of Si vacancy spin qubits in SiC [0.0]
We uncover the local vibrational modes of the Si vacancy spin qubits in as-grown 4H-SiC. Our findings give insight into the coupling of electronic states to vibrational modes in SiC spin qubits.
arXiv Detail & Related papers (2020-01-31T21:39:15Z)

This list is automatically generated from the titles and abstracts of the papers in this site.