Quantum toys for quantum computing: persistent currents controled by spin chirality

Abstract

Quantum devices and computers will need operational units in different architectural configurations for their functioning. The unit should be a simple ``quantum toy'', easy to handle superposition states. Here a novel such unit of quantum mechanical flux state (or persistent current) in a conducting ring with three ferromagnetic quantum dots is presented. The state is labeled by the two direction of the persistent current, which is driven by the spin chirality of the dots, and is controled by the spin. It is demosntrated that by use of two rings connected, one can carry out unitary transformations on the input flux state by controling one spin in one of the rings, unabling us to prepare superposition states. The flux is shown to be a quantum XOR operation gate, and may be useful in quantum computing.

References in corpus (5)

• Quantum Computation with Quantum Dots
• Kondo Physics in a Single Electron Transistor
• Measurement of conditional phase shifts for quantum logic
• Josephson-Junction Qubits with Controlled Couplings
• Permanent current from non-commutative spin algebra

Cited by in corpus (14)

• Spin current and magneto-electric effect in non-collinear magnets
• Microscopic approach to current-driven domain wall dynamics
• Josephson and Persistent Spin Currents in Bose-Einstein Condensates of Magnons
• Equilibrium spin currents and magnetoelectric effect in magnetic nanostructures
• Chirality-driven orbital magnetic moments as a new probe for topological magnetic structures
• Generalized quasiclassical theory of the long-range proximity effect and spontaneous currents in superconducting heterostructures with strong ferromagnets
• Quantum circuits based on coded qubits encoded in chirality of electron spin complexes in triple quantum dots
• Topological insulator ring with magnetic impurities
• Controlled Operations in a Strongly Correlated Two-Electron Quantum Ring
• Impurity-induced orbital magnetization in a Rashba electron gas
• Bias-induced chiral current and topological blockadein triple quantum dots
• Nonlocal orbital magnetism of 3d adatoms deposited on the Pt(111) surface
• Insights into the orbital magnetism of noncollinear magnetic systems
• Topological spin Hall effect in antiferromagnets driven by vector Néel chirality