Electron Spins in Artificial Atoms and Molecules for Quantum Computing

Abstract

Achieving control over the electron spin in quantum dots (artificial atoms) or real atoms promises access to new technologies in conventional and in quantum information processing. Here we review our proposal for quantum computing with spins of electrons confined to quantum dots. We discuss the basic requirements for implementing spin-qubits, and describe a complete set of quantum gates for single- and two-qubit operations. We show how a quantum dot attached to leads can be used for spin filtering and spin read-out, and as a spin-memory device. Finally, we focus on the experimental characterization of the quantum dot systems, and discuss transport properties of a double-dot and show how Kondo correlations can be used to measure the Heisenberg exchange interaction between the spins of two dots.

13 pages, 8 figures, Invited Review (Semiconductor Spintronics, Special Issue of SST)

References in corpus (5)

• Kondo effect in real quantum dots
• Cancellation of Spin-Orbit Effects in Quantum Gates Based on the Exchange Coupling in Quantum Dots
• Kondo effect induced by a magnetic field
• Spin-based quantum computation in multielectron quantum dots
• Mean Field Theory of the Kondo Effect in Quantum Dots with an Even Number of Electrons

Cited by in corpus (18)

• Ferromagnetic semiconductors
• Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence
• Mesoscopic Cavity Quantum Electrodynamics with Quantum Dots
• Transport through a double quantum dot in the sequential- and co- tunneling regimes
• Efficient generation of graph states for quantum computation
• Probing level renormalization by sequential transport through double quantum dots
• All-Electrical Quantum Computation with Mobile Spin Qubits
• Readout scheme of the fullerene-based quantum computer by a single electron transistor
• Spin relaxation in diluted magnetic semiconductor quantum dots
• Combined atomic force microscope and electron-beam lithography used for the fabrication of variable-coupling quantum dots
• Quantum state transfer with untuneable couplings
• Dynamics of a two-level system coupled with a quantum oscillator in the very strong coupling limit
• Aharonov-Bohm phase operations on a double-barrier nanoring charge qubit
• Dynamics of a quantum oscillator strongly and off-resonantly coupled with a two-level system
• Four-level systems and a universal quantum gate
• The readout of the fullerene-based quantum computing by a scanning tunneling microscope
• Two and four-level systems in magnetic fields restricted in time
• Spin-Dependent Transport through the Finite Array of Quantum Dots: Spin Gun