Theory of semiconductor quantum-wire based single- and two-qubit gates

Abstract

A GaAs/AlGaAs based two-qubit quantum device that allows the controlled generation and straightforward detection of entanglement by measuring a stationary current-voltage characteristic is proposed. We have developed a two-particle Green's function method of open systems and calculate the properties of three-dimensional interacting entangled systems non-perturbatively. We present concrete device designs and detailed, charge self-consistent predictions. One of the qubits is an all-electric Mach-Zehnder interferometer that consists of two electrostatically defined quantum wires with coupling windows, whereas the second qubit is an electrostatically defined double quantum dot located in a second two-dimensional electron gas beneath the quantum wires. We find that the entanglement of the device can be controlled externally by tuning the tunneling coupling between the two quantum dots.

16 pages, 13 figures, RevTex4 two-column format, to appear in Phys. Rev. B

References in corpus (13)

• Quantum Computation with Quantum Dots
• Electron transport through double quantum dots
• Experimental realization of Shor's quantum factoring algorithm using nuclear magnetic resonance
• Driven coherent oscillations of a single electron spin in a quantum dot
• Two-Bit Gates are Universal for Quantum Computation
• An Electronic Mach-Zehnder Interferometer
• Quantum Logic Gates in Optical Lattices
• A Simple Quantum Computer
• Recent advances in exciton based quantum information processing in quantum dot nanostructures
• Quantum Computation with Ballistic Electrons
• Testing Bell's Inequality with Ballistic Electrons in Semiconductors
• Coulomb-Blockade directional coupler
• Coulomb entangler and entanglement testing network for waveguide qubits

Cited by in corpus (11)

• Implementing quantum gates through scattering between a static and a flying qubit
• Processing quantum signals carried by electrical currents
• Aharonov-Bohm interferometry with a tunnel-coupled wire
• Spin rotation by resonant electric field in few-level quantum dots: Floquet dynamics and tunneling
• Optical switching of electron transport in a waveguide-QED system
• Electron interference and entanglement in coupled 1D systems with noise
• Generation of spin-dependent coherent states in a quantum wire
• Cavity-photon-switched coherent transient transport in a double quantum waveguide
• Coherent transient transport of interacting electrons through a quantum waveguide switch
• Reconfigurable quantum logic gates using Rashba controlled spin polarized currents
• Semiconductor-based electron flying qubits: Review on recent progress accelerated by numerical modelling