Quantum hydrodynamics of spin winding

Tserkovnyak, Yaroslav; Zou, Ji; Kim, Se‐Kwon; Takei, So

doi:10.1103/physrevb.102.224433

Cited by 11 publications

(5 citation statements)

References 34 publications

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“…Clearly, a description of the dynamics in the MOI in this nonequilibrium regime is challenging as chaotic dynamics may be encountered, but it will be insightful to see if such an effective zero damping state allows the investigation of magnon Bose-Einstein condensates and related phenomena. [29,[193][194][195][196][197][198][199][200][201][202]254] The field of antiferromagnetic magnonics has received exceedingly more interest in the last years. [94,255] As the natural frequency of magnons in antiferromagnets is THz, NM/AFI heterostructures allow realization of SHNOs operating at THz frequencies, enabling DC-to-THz conversion.…”

Section: Discussionmentioning

confidence: 99%

All‐Electrical Magnon Transport Experiments in Magnetically Ordered Insulators

Althammer

2021

Physica Rapid Research Ltrs

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Angular momentum transport is one of the cornerstones of spintronics. Spin angular momentum is not only transported by mobile charge carriers but also by the quantized excitations of the magnetic lattice in magnetically ordered systems. In this regard, magnetically ordered insulators (MOIs) provide a platform for magnon spin transport experiments without additional contributions from spin currents carried by mobile electrons. In combination with charge‐to‐spin current conversion processes in conductors with finite spin–orbit coupling, it is possible to realize all‐electrical magnon transport schemes in thin‐film heterostructures. Herein, an insight into such experiments and recent breakthroughs achieved is provided. Special attention is given to charge‐current‐based manipulation via an adjacent normal metal of magnon transport in MOIs in terms of spin‐transfer torque. Moreover, the influence of two magnon modes with opposite spin in antiferromagnetic insulators on all‐electrical magnon transport experiments is discussed.

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Section: Discussionmentioning

confidence: 99%

All‐Electrical Magnon Transport Experiments in Magnetically Ordered Insulators

Althammer

2021

Physica Rapid Research Ltrs

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“…We then consider the following Hamiltonian: where are the Pauli matrices for qubit i and ℏ is the Planck’s constant. We describe the environment with where b k and are operators describing quasiparticles in the environment leading to the decoherence of the qubits, such as phonons in semiconductors 68 – 70 or magnons in hybrid systems 71 – 80 . While we leave the spectrum ω k unspecified which can be either linear, for example, for acoustic phonons or quadratic for magnons, we specialize to single axis qubit-environment couplings: implying that pure-dephasing dynamics dominates the decoherence process in the absence of coherent drives.…”

Section: Resultsmentioning

confidence: 99%

Spatially correlated classical and quantum noise in driven qubits

Zou,

Bosco,

Loss

2024

npj Quantum Inf

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Correlated noise across multiple qubits poses a significant challenge for achieving scalable and fault-tolerant quantum processors. Despite recent experimental efforts to quantify this noise in various qubit architectures, a comprehensive understanding of its role in qubit dynamics remains elusive. Here, we present an analytical study of the dynamics of driven qubits under spatially correlated noise, including both Markovian and non-Markovian noise. Surprisingly, we find that by operating the qubit system at low temperatures, where correlated quantum noise plays an important role, significant long-lived entanglement between qubits can be generated. Importantly, this generation process can be controlled on-demand by turning the qubit driving on and off. On the other hand, we demonstrate that by operating the system at a higher temperature, the crosstalk between qubits induced by the correlated noise is unexpectedly suppressed. We finally reveal the impact of spatio-temporally correlated 1/f noise on the decoherence rate, and how its temporal correlations restore lost entanglement. Our findings provide critical insights into not only suppressing crosstalk between qubits caused by correlated noise but also in effectively leveraging such noise as a beneficial resource for controlled entanglement generation.

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“…It would be highly interesting to investigate these charge current induced changes in MOIs with different magnetic order to verify the assumed theoretical models. Clearly, a description of the dynamics in the MOI in this non-equilibrium regime is challenging as chaotic dynamics may be encountered, but it will be insightful to see if such an effective zero damping state allows the investigation of magnon Bose-Einstein condensates and related phenomena 27,[129][130][131][132][133][134][135][136][137][138]189 .…”

Section: Discussionmentioning

confidence: 99%

All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators

Althammer

2021

Preprint

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Angular momentum transport is one of the cornerstones of spintronics. Spin angular momentum is not only transported by mobile charge carriers, but also by the quantized excitations of the magnetic lattice in magnetically ordered systems. In this regard, magnetically ordered insulators provide a platform for magnon spin transport experiments without additional contributions from spin currents carried by mobile electrons. In combination with charge-to-spin current conversion processes in conductors with finite spin-orbit coupling it is possible to realize all-electrical magnon transport schemes in thin film heterostructures. This review provides an insight into such experiments and recent breakthroughs achieved. Special attention is given to charge current based manipulation via an adjacent normal metal of magnon transport in magnetically ordered insulators in terms of spin-transfer torque. Moreover, the influence of two magnon modes with opposite spin in antiferromagnetic insulators on all-electrical magnon transport experiments is discussed.

show abstract

Quantum hydrodynamics of spin winding

Cited by 11 publications

References 34 publications

All‐Electrical Magnon Transport Experiments in Magnetically Ordered Insulators

All‐Electrical Magnon Transport Experiments in Magnetically Ordered Insulators

Spatially correlated classical and quantum noise in driven qubits

All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators

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