Long-range spin wave mediated control of defect qubits in nanodiamonds

Andrich, Paolo; Casas, Charles F. de las; Li, Xiaoying; Bretscher, Hope; Berman, Jonson R.; Heremans, F. Joseph; Nealey, Paul F.; Awschalom, D. D.

doi:10.1038/s41534-017-0029-z

Cited by 133 publications

(109 citation statements)

References 35 publications

Supporting

Mentioning

106

Contrasting

Order By: Relevance

“…This number of spins is maximised in ferromagnetic crystals, particularly Yttrium Iron Garnet (YIG), that have been proposed as the core sensing element in previous proposals 25,26,28 . In addition to this, high quality YIG is characterised by relatively narrow linewidths that makes it a popular choice for research in the field of hybrid quantum system for future quantum information processing [34][35][36][37][38][39] . Also, it has been proposed to use a microwave cavity to read out axion induced magnetisation.…”

Section: B Ferromagnetic Haloscopesmentioning

confidence: 99%

Broadening frequency range of a ferromagnetic axion haloscope with strongly coupled cavity–magnon polaritons

Flower

Bourhill

Goryachev

et al. 2019

Physics of the Dark Universe

View full text Add to dashboard Cite

With the axion being a prime candidate for dark matter, there has been some recent interest in direct detection through a so called 'Ferromagnetic haloscope.' Such devices exploit the coupling between axions and electrons in the form of collective spin excitations of magnetic materials with the readout through a microwave cavity. Here, we present a new, general, theoretical treatment of such experiments in a Hamiltonian formulation for strongly coupled magnons and photons, which hybridise as cavity-magnon polaritons. Such strongly coupled systems have an extended measurable dispersive regime. Thus, we extend the analysis and operation of such experiments into the dispersive regime, which allows any ferromagnetic haloscope to achieve improved bandwidth with respect to the axion mass parameter space. This experiment was implemented in a cryogenic setup, and initial search results are presented setting laboratory limits on the axion-electron coupling strength of g aee > 3.7 × 10 −9 in the range 33.79 µeV< m a < 33.94 µeV with 95% confidence. The potential bandwidth of the Ferromagnetic haloscope was calculated to be in two bands, the first of about 1 GHz around 8.24 GHz (or 4.1 µeV mass range around 34.1 µeV) and the second of about 1.6 GHz around 10 GHz (6.6 µeV mass range around 41.4 µeV). Frequency tuning may also be easily achieved via an external magnetic field which changes the ferromagnetic resonant frequency with respect to the cavity frequency. The requirements necessary for future improvements to reach the DFSZ axion model band are discussed in the paper.

show abstract

Section: B Ferromagnetic Haloscopesmentioning

confidence: 99%

Broadening frequency range of a ferromagnetic axion haloscope with strongly coupled cavity–magnon polaritons

Flower

Bourhill

Goryachev

et al. 2019

Physics of the Dark Universe

View full text Add to dashboard Cite

show abstract

“…We calculate the effect of spin wave excitation inside ferromagnetic thin films as used for example in the ex-periment presented by Andrich et al 1 . The vicinity of a spin wave hosting material to a quantum system driven by external microwaves provides an additional component of the driving field.…”

Section: Setupmentioning

confidence: 99%

Magnetic resonance in defect spins mediated by spin waves

2019

View full text Add to dashboard Cite

In search of two level quantum systems that implement a qubit, the nitrogen-vacancy (NV) center in diamond has been intensively studied for years. Despite favorable properties such as remarkable defect spin coherence times, the addressability of NV centers raises some technical issues. The coupling of a single NV center to an external driving field is limited to short distances, since an efficient coupling requires the NV to be separated by only a few microns away from the source. As a way to overcome this problem, an enhancement of coherent coupling between NV centers and a microwave field has recently been experimentally demonstrated using spin waves propagating in an adjacent yttrium iron garnet (YIG) film 1 . In this paper we analyze the optically detected magnetic resonance spectra that arise when an NV center is placed on top of a YIG film for a geometry similar to the one in the experiment. We analytically calculate the oscillating magnetic field of the spin wave on top of the YIG surface to determine the coupling of spin waves to the NV center. We compare this coupling to the case when the spin waves are absent and the NV center is driven only with the antenna field and show that the calculated coupling enhancement is dramatic and agrees well with the one obtained in the recent experiment.

show abstract

“…Magnonic systems have been of considerable interest recently. Applications of such systems range from quantum information processing [1][2][3] and coherent conversion of microwave to optical frequency light [4,5], to microwave components in the form of filters, circulators, isolators and oscillators. Additionally, such systems are used in the study of hybrid quantum systems [6,7], Quantum electrodynamics (QED) [8][9][10], and direct detection of dark matter [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

et al. 2019

View full text Add to dashboard Cite

Several experimental implementations of cavity-magnon systems are presented. First an Yttrium Iron Garnet (YIG) block is placed inside a re-entrant cavity where the resulting hybrid mode is measured to be in the ultra strong coupling (USC) regime. When fully hybridised the ratio between the coupling rate and uncoupled mode frequencies is determined to be g/ω=0.46. Next a thin YIG cylinder is placed inside a loop gap cavity. The bright mode of this cavity couples to the YIG sample and is similarly measured to be in the USC regime with ratio of coupling rate to uncoupled mode frequencies as g/ω=0.34. A larger spin density medium such as lithium ferrite (LiFe) is expected to improve couplings by a factor of 1.46 in both systems as coupling strength is shown to be proportional to the square root of spin density and magnetic moment. Such strongly coupled systems are potentially useful for cavity QED, hybrid quantum systems and precision dark matter detection experiments. The YIG disc in the loop gap cavity, is, in particular, shown to be a strong candidate for dark matter detection. Finally, a LiFe sphere inside a two post re-entrant cavity is considered. In past work it was shown that the magnon mode in the sample has a turnover point in frequency (Goryachev et al 2018 Phys. Rev. B 97 155129). Additionally, it was predicted that if the system was engineered such that it fully hybridised at this turnover point the cavity-magnon polariton transition frequency would become insensitive to both first and second order magnetic bias field fluctuations, a result useful for precision frequency applications. This work implements such a system by engineering the cavity mode frequency to near this turnover point, with suppression in sensitivity to second order bias magnetic field fluctuations shown.

show abstract

Long-range spin wave mediated control of defect qubits in nanodiamonds

Cited by 133 publications

References 35 publications

Broadening frequency range of a ferromagnetic axion haloscope with strongly coupled cavity–magnon polaritons

Broadening frequency range of a ferromagnetic axion haloscope with strongly coupled cavity–magnon polaritons

Magnetic resonance in defect spins mediated by spin waves

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

Contact Info

Product

Resources

About