Sensing chiral magnetic noise via quantum impurity relaxometry

Rustagi, Avinash; Bertelli, Iacopo; Sar, Toeno van der; Upadhyaya, Pramey

doi:10.1103/physrevb.102.220403

Cited by 32 publications

(29 citation statements)

References 36 publications

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“…21(b). Rustagi et al [400] further addressed the influence of chiral magnetic noise on the qubit relaxation. In particular, the left-moving and right-moving magnons produce unequal magnetic noise and they are respectively coupled to the = 0 → −1 transition (Γ − ) and = 0 → +1 transitions (Γ + ) in an NV center.…”

Section: Detecting Magnetism By Single-spin Qubitsmentioning

confidence: 99%

Quantum magnonics: when magnon spintronics meets quantum information science

Yuan,

Cao,

Kamra

et al. 2021

Preprint

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Spintronics and quantum information science are two promising candidates for innovating information processing technologies. The combination of these two fields enables us to build solid-state platforms for studying quantum phenomena and for realizing multi-functional quantum tasks. For a long time, however, the intersection of these two fields was limited due to the distinct properties of the classical magnetization, that is manipulated in spintronics, and quantum bits, that are utilized in quantum information science. This situation has changed significantly over the last few years because of the remarkable progress in coding and processing information using magnons. On the other hand, significant advances in understanding the entanglement of quasi-particles and in designing high-quality qubits and photonic cavities for quantum information processing provide physical platforms to integrate magnons with quantum systems. From these endeavours, the highly interdisciplinary field of quantum magnonics emerges, which combines spintronics, quantum optics and quantum information science. Here, we give an overview of the recent developments concerning the quantum states of magnons and their hybridization with mature quantum platforms. First, we review the basic concepts of magnons and quantum entanglement and discuss the generation and manipulation of quantum states of magnons, such as single-magnon states, squeezed states and quantum many-body states including Bose-Einstein condensation and the resulting spin superfluidity. We discuss how magnonic systems can be integrated and entangled with quantum platforms including cavity photons, superconducting qubits, nitrogen-vacancy centers, and phonons for coherent information transfer and collaborative information processing. The implications of these hybrid quantum systems for non-Hermitian physics and parity-time symmetry are highlighted, together with applications in quantum memories and high-precision measurements. Finally, we present an outlook on some of the challenges and opportunities in quantum magnonics.

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Section: Detecting Magnetism By Single-spin Qubitsmentioning

confidence: 99%

Quantum magnonics: when magnon spintronics meets quantum information science

Yuan,

Cao,

Kamra

et al. 2021

Preprint

View full text Add to dashboard Cite

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“…Previous works have developed theoretical underpinnings of probing different regimes of electron transport in metallic systems, as well as magnetic phases and their phase transitions in insulators, using quantum impurity probes [14,33,35]. On the experimental front, noise measurements using NV centers in diamond have very recently been used to detect a plethora of novel quantum phenomena, including non-local conductivity in metallic silver [36], magnetic transitions in metallic Gd [37], chiral magnons [38], spin-diffusion in antiferromagnets [39] and electron-phonon instabilities in graphene [40]. With the discovery of superconductivity in several new 2d materials, the qubit probe appears ideally suited to unravel their properties.…”

Section: Is the Spectral Function Andmentioning

confidence: 99%

Single-spin qubit magnetic spectroscopy of two dimensional superconductivity

Chatterjee,

Dolgirev,

Esterlis

et al. 2021

Preprint

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A single-spin qubit placed near the surface of a conductor acquires an additional contribution to its 1/T1 relaxation rate due to magnetic noise created by electric current fluctuations in the material. We analyze this technique as a wireless probe of superconductivity in atomically thin two dimensional materials. At temperatures T Tc, the dominant contribution to the qubit relaxation rate is due to transverse electric current fluctuations arising from quasiparticle excitations. We demonstrate that this method enables detection of metal-to-superconductor transitions, as well as investigation of the symmetry of the superconducting gap function, through the noise scaling with temperature. We show that scaling of the noise with sample-probe distance provides a window into the non-local quasi-static conductivity of superconductors, both clean and disordered. At low temperatures the quasiparticle fluctuations get suppressed, yet the noise can be substantial due to resonant contributions from collective longitudinal modes, such as plasmons in monolayers and Josephson plasmons in bilayers. Potential experimental implications are discussed.

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“…Hybrid quantum systems composed of NV centers and magnons in ferromagnets have emerged as a potential solution to this challenge [23][24][25][26][27][28][29][30][31][32][33], where NV spins are coupled to magnon modes through their dynamical fringe magnetic fields. Taking advantage of virtual-magnon exchange in one-dimensional spin chains [23] or transduction of energy quanta in ferromagnetic discs [28], NV-NV entanglement has been investigated theoretically [23,28], thus stimulating a variety of experiments on the NVmagnon hybrid system [34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Opportunities for long-range magnon-mediated entanglement of spin qubits via on- and off-resonant coupling

Fukami,

Candido,

Awschalom

et al. 2021

Preprint

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The ability to manipulate entanglement between multiple spatially-separated qubits is essential for quantum information processing. Although nitrogen-vacancy (NV) centers in diamond provide a promising qubit platform, developing scalable two-qubit gates remains a well-known challenge. To this end, magnon-mediated entanglement proposals have attracted attention due to their long-range spin-coherent propagation. Optimal device geometries and gate protocols of such schemes, however, have yet to be determined. Here we predict strong long-distance (> µm) NV-NV coupling via magnon modes with cooperativities exceeding unity in ferromagnetic bar and waveguide structures. Moreover, we explore and compare on-resonant transduction and off-resonant virtual-magnon exchange protocols, and discuss their suitability for generating or manipulating entangled states at low temperatures (T 150 mK) under realistic experimental conditions. This work will guide future experiments that aim to entangle spin qubits in solids with magnon excitations.

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Sensing chiral magnetic noise via quantum impurity relaxometry

Cited by 32 publications

References 36 publications

Quantum magnonics: when magnon spintronics meets quantum information science

Quantum magnonics: when magnon spintronics meets quantum information science

Single-spin qubit magnetic spectroscopy of two dimensional superconductivity

Opportunities for long-range magnon-mediated entanglement of spin qubits via on- and off-resonant coupling

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