Driven quantum dot coupled to a fractional quantum Hall edge

Wagner, Glenn; Nguyen, Dung Xuan; Kovrizhin, D. L.; Simon, Steven H.

doi:10.1103/physrevb.100.245111

Cited by 5 publications

(5 citation statements)

References 56 publications

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“…The most important cases would involve superconductors [ 18 , 19 , 212 , 213 , 214 , 215 , 216 , 217 ] or fractional Quantum Hall edges states, in which quantum noise measurements have been crucial to address and unveil the dynamics of fractionally charged excitations [ 218 , 219 , 220 , 221 , 222 , 223 , 224 , 225 , 226 , 227 , 228 , 229 , 230 , 231 , 232 , 233 , 234 , 235 ]. Additionally, the recent realization of noiseless levitons [ 8 , 9 , 10 , 11 , 12 ] paves the way to interesting perspectives to investigate flying anyons [ 13 , 220 , 236 ] and novel interesting dynamical effects [ 188 , 189 , 237 ].…”

Section: Discussionmentioning

confidence: 99%

Phase-Coherent Dynamics of Quantum Devices with Local Interactions

Filippone

Marguerite

Hur

et al. 2020

Entropy

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This review illustrates how Local Fermi Liquid (LFL) theories describe the strongly correlated and coherent low-energy dynamics of quantum dot devices. This approach consists in an effective elastic scattering theory, accounting exactly for strong correlations. Here, we focus on the mesoscopic capacitor and recent experiments achieving a Coulomb-induced quantum state transfer. Extending to out-of-equilibrium regimes, aimed at triggered single electron emission, we illustrate how inelastic effects become crucial, requiring approaches beyond LFLs, shedding new light on past experimental data by showing clear interaction effects in the dynamics of mesoscopic capacitors.

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Section: Discussionmentioning

confidence: 99%

Phase-Coherent Dynamics of Quantum Devices with Local Interactions

Filippone

Marguerite

Hur

et al. 2020

Entropy

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“…In such systems the effective coupling between spin qubits can be established using ferromagnetic (FM) magnons [32][33][34], antiferromagnetic domain walls [35] or magnon waveguides [36]. An other promising approach to mitigate dissipation is to couple spin qubits via topological edge states in quantum Hall systems [37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Long-distance coupling of spin qubits via topological magnons

Hetényi,

Mook,

Klinovaja

et al. 2022

Preprint

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We consider two distant spin qubits in quantum dots, both coupled to a two-dimensional topological ferromagnet hosting chiral magnon edge states at the boundary. The chiral magnon is used to mediate entanglement between the spin qubits, realizing a fundamental building block of scalable quantum computing architectures: a long-distance two-qubit gate. Previous proposals for long-distance coupling with magnons involved off-resonant coupling, where the detuning of the spin-qubit frequency from the magnonic band edge provides protection against spontaneous relaxation. The topological magnon mode, on the other hand, lies in-between two magnonic bands far away from any bulk magnon resonances, facilitating strong and highly tuneable coupling between the two spin qubits. Even though the coupling between the qubit and the chiral magnon is resonant for a wide range of qubit splittings, we find that the magnon-induced qubit relaxation is vastly suppressed if the coupling between the qubit and the ferromagnet is antiferromagnetic. A fast and high-fidelity long-distance coupling protocol is presented capable of achieving spin-qubit entanglement over micrometer distances with 1 MHz gate speed and up to 99.9% fidelities. The resulting spin-qubit entanglement may be used as a probe for the long-sought detection of topological edge magnons.

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“…In such systems, the effective coupling between spin qubits can be established using ferromagnetic (FM) magnons [36][37][38][39], antiferromagnetic domain walls [40] or magnon waveguides [41]. An other promising approach to mitigate dissipation is to couple spin qubits via topological edge states in quantum Hall systems, which are remarkably robust against various types of disorder [42][43][44][45][46], promising a successful experimental implementation of high-fidelity quantum gates.…”

Section: Introductionmentioning

confidence: 99%

Long-distance coupling of spin qubits via topological magnons

et al. 2022

View full text Add to dashboard Cite

We consider two distant spin qubits in quantum dots, both coupled to a two-dimensional topological ferromagnet hosting chiral magnon edge states at the boundary. The chiral magnon is used to mediate entanglement between the spin qubits, realizing a fundamental building block of scalable quantum computing architectures: a long-distance two-qubit gate. Previous proposals for long-distance coupling with magnons involved off-resonant coupling, where the detuning of the spin-qubit frequency from the magnonic band edge provides protection against spontaneous relaxation. The topological magnon mode, on the other hand, lies in between two magnonic bands far away from any bulk magnon resonances, facilitating strong and highly tuneable coupling between the two spin qubits. Even though the coupling between the qubit and the chiral magnon is resonant for a wide range of qubit splittings, we find that the magnon-induced qubit relaxation is vastly suppressed if the coupling between the qubit and the ferromagnet is antiferromagnetic. A fast and high-fidelity long-distance coupling protocol is presented capable of achieving spin-qubit entanglement over micrometer distances with 1 MHz gate speed and up to 99.9% fidelities. The resulting spin-qubit entanglement may be used as a probe for the long-sought detection of topological edge magnons.

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Driven quantum dot coupled to a fractional quantum Hall edge

Cited by 5 publications

References 56 publications

Phase-Coherent Dynamics of Quantum Devices with Local Interactions

Phase-Coherent Dynamics of Quantum Devices with Local Interactions

Long-distance coupling of spin qubits via topological magnons

Long-distance coupling of spin qubits via topological magnons

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