Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:quant-ph/0011051 · International Journal of Modern Physics B

QUANTUM COMPUTATION WITH BALLISTIC ELECTRONS

Radu Ionicioiu, Gehan A. J. Amaratunga, Florin Udrea

Published Jan 20, 2001• 68 citations
arXivHTMLPDF

Abstract

We describe a solid state implementation of a quantum computer using ballistic single electrons as flying qubits in 1D nanowires. We show how to implement all the steps required for universal quantum computation: preparation of the initial state, measurement of the final state and a universal set of quantum gates. An important advantage of this model is the fact that we do not need ultrafast optoelectronics for gate operations. We use cold programming (or pre-programming), i.e. the gates are set before launching the electrons; all programming can be done using static electric fields only.

DOI
10.1142/s0217979201003521

Related papers

Ballistic Single-Electron Quputer

Radu Ionicioiu, Gehan J. Amaratunga, Florin Udrea

We propose a new solid state implementation of a quantum computer (quputer) using ballistic single electrons as flying qubits in 1D nanowires. We use a single electron pump (SEP) to prepare the initial state and a single electron transistor (SET) to measure the final state. Single qubit gates are implemented using quantum dots as phase shifters and electron waveguide couplers as beam splitters. A Coulomb coupler acts as a 2-qubit gate, using a mutual phase modulation effect. Since the electron phase coherence length in GaAs/AlGaAs heterostructures is of the order of 30$μ$m, several gates (tens) can be implemented before the system decoheres.

arXiv:quant-ph/9907043•Jul 11, 1999•4 citations

Quantum computation with ballistic qubits

Radu Ionicioiu, G. A. J. Amaratunga, A. Popescu +1 more

We give a brief introduction to quantum computation and we discuss a possible solid state implementation. We show how to prepare and measure qubit states and how to implement single and 2-qubit gates with ballistic electrons.

CAS proceedings•Nov 7, 2002•0 citations

Entanglement and quantum computing with ballistic electrons

Andrea Bertoni, Susanna Reggiani

We first present a brief review of the basic requirements, proposals and prototype implementations for quantum computing devices. Then we introduce a specific universal set of quantum gates and describe a physical system, based on coupled quantum wires, that should be able to realize the proposed quantum transformations. Finally, the dynamics of entanglement-creation between two ballistic electrons is analysed for a model system.

Semiconductor Science and Technology•Mar 3, 2004•11 citations

Quantum Computation and Proposal for Solid-state Quantum Gates

Andrea Bertoni, Susanna Reggiani

We present a brief review of the basic requirements for a quantum-computing device based on solid-state technology. An overview covering many prototype implementations and proposals is first presented. Then, the formalism used to describe the quantum transformations is introduced, together with the characteristics that make a set of quantum gates universal. Finally, a simulative analysis of a physical system based on coherent electron propagation in quantum wires shows how such a system meets the requirements for the realization of a universal set of quantum gates.

European Solid-State Device Research Conference•Jan 1, 2002•3 citations

Universal quantum computation using exchange interactions and measurements of single- and two-spin observables

Lian-Ao Wu, Daniel A. Lidar

We show how to construct a universal set of quantum logic gates using control over exchange interactions and single- and two-spin measurements only. Single-spin unitary operations are teleported between neighboring spins instead of being executed directly, thus potentially eliminating a major difficulty in the construction of several of the most promising proposals for solid-state quantum computation, such as spin-coupled quantum dots, donor-atom nuclear spins in silicon, and electrons on helium. Contrary to previous proposals dealing with this difficulty, our scheme requires no encoding redundancy. We also discuss an application to superconducting phase qubits.

arXiv:quant-ph/0208118•Physical Review A•May 28, 2003•13 citations

Quantum computation with quantum dots

Daniel Loss, David Peter Divincenzo

We propose an implementation of a universal set of one- and two-quantum-bit gates for quantum computation using the spin states of coupled single-electron quantum dots. Desired operations are effected by the gating of the tunneling barrier between neighboring dots. Several measures of the gate quality are computed within a recently derived spin master equation incorporating decoherence caused by a prototypical magnetic environment. Dot-array experiments that would provide an initial demonstration of the desired nonequilibrium spin dynamics are proposed.

arXiv:cond-mat/9701055•Physical Review A•Jan 1, 1998•6,829 citations
We describe a solid state implementation of a quantum computer using ballistic single electrons as flying qubits in 1D nanowires. We show how to implement all the steps required for universal quantum computation: preparation of the initial state, measurement of the final state and a universal set of quantum gates. An important advantage of this model is the fact that we do not need ultrafast optoelectronics for gate operations. We use cold programming (or pre-programming), i.e. the gates are set before launching the electrons; all programming can be done using static electric fields only.
We propose a new solid state implementation of a quantum computer (quputer) using ballistic single electrons as flying qubits in 1D nanowires. We use a single electron pump (SEP) to prepare the initial state and a single electron transistor (SET) to measure the final state. Single qubit gates are implemented using quantum dots as phase shifters and electron waveguide couplers as beam splitters. A Coulomb coupler acts as a 2-qubit gate, using a mutual phase modulation effect. Since the electron phase coherence length in GaAs/AlGaAs heterostructures is of the order of 30μμμm, several gates (tens) can be implemented before the system decoheres.
We present a brief review of the basic requirements for a quantum-computing device based on solid-state technology. An overview covering many prototype implementations and proposals is first presented. Then, the formalism used to describe the quantum transformations is introduced, together with the characteristics that make a set of quantum gates universal. Finally, a simulative analysis of a physical system based on coherent electron propagation in quantum wires shows how such a system meets the requirements for the realization of a universal set of quantum gates.
We show how to construct a universal set of quantum logic gates using control over exchange interactions and single- and two-spin measurements only. Single-spin unitary operations are teleported between neighboring spins instead of being executed directly, thus potentially eliminating a major difficulty in the construction of several of the most promising proposals for solid-state quantum computation, such as spin-coupled quantum dots, donor-atom nuclear spins in silicon, and electrons on helium. Contrary to previous proposals dealing with this difficulty, our scheme requires no encoding redundancy. We also discuss an application to superconducting phase qubits.
We propose an implementation of a universal set of one- and two-quantum-bit gates for quantum computation using the spin states of coupled single-electron quantum dots. Desired operations are effected by the gating of the tunneling barrier between neighboring dots. Several measures of the gate quality are computed within a recently derived spin master equation incorporating decoherence caused by a prototypical magnetic environment. Dot-array experiments that would provide an initial demonstration of the desired nonequilibrium spin dynamics are proposed.