Spin Superfluid Josephson Phase Qubits

Abstract

A macroscopic spintronic qubit based on spin superfluidity and spin Hall phenomena is proposed. This magnetic quantum information processing device realizes the spin-supercurrent analog of the superconducting phase qubit and allows for full electrical control and readout. We also show that an array of interacting magnetic phase qubits can realize a quantum annealer. These devices can be built through standard solid-state fabrication technology, allowing for scalability. However, the upper bound for the operational temperature can, in principle, be higher than the superconducting counterpart, as it is ultimately governed by the magnetic ordering temperatures, which could be much higher than the critical temperatures of the conventional superconducting devices.

7 pages, 2 figures

References in corpus (6)

• Randomized Benchmarking of Quantum Gates
• Antiferromagnonic Spin Transport from Y${}_3$Fe${}_5$O${}_{12}$ into NiO
• Computational Role of Multiqubit Tunneling in a Quantum Annealer
• Superfluid spin transport through antiferromagnetic insulators
• Anti-damping spin transfer torque through epitaxial Nickel oxide
• Spin Hall phenomenology of magnetic dynamics

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• Quantum control of topological defects in magnetic systems
• Energy storage in magnetic textures driven by vorticity flow
• Dissipationless Spin-Charge Conversion in Excitonic Pseudospin Superfluid
• Tunable Ultrafast Dynamics of Antiferromagnetic Vortices in Nanoscale Dots
• Geometric phase driven Josephson junction: Possible experimental scheme for the search of spin superfluidity
• Josephson-like magnetic tunnel junction -- transition from classical to quantum regime
• Superconducting magnetoelectric effects in mesoscopic hybrid structures