Universal quantum computing with correlated spin-charge states

Abstract

We propose a universal quantum computing scheme in which the orthogonal qubit states $|0>$ and $|1>$ are identical in their single-particle spin and charge properties. Each qubit is contained in a single quantum dot and gate operations are induced all-electrically by changes in the confinement potential. Within the computational space, these qubits are robust against environmental influences that couple to the system through single-particle channels. Due to the identical spin and charge properties of the $|0>$, $|1>$ states, the lowest-order relaxation and decoherence rates $1/T_1$ and $1/T_2$, within the Born-Markov approximation, both vanish for a large class of environmental couplings. We give explicit pulse sequences for a universal set of gates (phase, $\pi /8$, Hadamard, \textsc{cnot}) and discuss state preparation, manipulation, and detection.

6 pages, 3 eps figures, revtex4

References in corpus (2)

• Single-shot read-out of an individual electron spin in a quantum dot
• Coherent rotations of a single spin-based qubit in a single quantum dot at fixed Zeeman energy

Cited by in corpus (2)

• Three-electron anisotropic quantum dots in variable magnetic fields: exact results for excitation spectra, spin structures, and entanglement
• Exchange-controlled single-electron-spin rotations in quantum dots