Manipulating quantum spins by spin-polarized current: an approach based upon [Formula: see text]-symmetric quantum...

Area of Science:

• Quantum computing
• Molecular magnetism
• Spintronics

Background:

• Recent advances in non-Hermitian (anti-Hermitian) quantum mechanics have provided stability thresholds for non-equilibrium systems.
• Magnetization reversal by spin transfer torque is a key phenomenon in spintronics, typically studied in the classical limit of large spins.

Purpose of the Study:

• To propose a quantum processor design utilizing single-molecule magnets and spin transfer torque.
• To investigate the quantum dynamics of small spins under spin transfer torque using anti-Hermitian quantum mechanics.
• To explore the potential for electric current-based manipulation of spin qubits.

Main Methods:

• Utilizing anti-Hermitian (anti-Hermitian) quantum mechanics to describe spin transfer torque phenomena.
• Analyzing spin tunneling and quantum dynamics of small spins.
• Developing a theoretical framework for a quantum processor based on single-molecule magnets.

Main Results:

• Demonstrated the applicability of anti-Hermitian quantum mechanics to magnetization reversal problems.
• Investigated quantum spin dynamics and spin tunneling induced by spin-polarized currents.
• Established a theoretical basis for manipulating spin qubits with electric currents.

Conclusions:

• The proposed quantum processor architecture offers a novel approach to quantum computation.
• Anti-Hermitian quantum mechanics provides a powerful framework for understanding quantum phenomena in driven systems.
• Electric current control of spin qubits is feasible using single-molecule magnets and spin transfer torque.