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arXiv:cond-mat/0203215 · The European Physical Journal B

Electron teleportation with quantum dot arrays

Olivier Sauret, D. Feinberg, Thierry Martin

Published Apr 1, 2003• 21 citations
arXivHTMLPDF
DOI
10.1140/epjb/e2003-00133-4

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Teleportation on a Quantum Dot Array

FERDINANDO DE PASQUALE

We present a model of quantum teleportation protocol based on a double quantum dot array. The unknown qubit is encoded using a pair of quantum dots, with one excess electron, coupled by tunneling. It is shown how to create a maximally entangled state using an adiabatically increasing Coulomb repulsion between different dot pairs. This entangled state is exploited to perform teleportation again using an adiabatic coupling between itself and the incoming unknown state. Finally, a sudden separation of Bob’s qubit allows a time evolution of Alice’s which amounts to a modified version of standard Bell measurement. A transmission over a long distance could be obtained by considering the entangled state of a chain of N coupled double quantum dots. The system is shown to be increasingly robust with N against decoherence due to phonons.

AIP conference proceedings•Jan 1, 2004•0 citations
An electron teleportation protocol, inspired by the scenario by Bennett et al., is proposed in a mesoscopic set-up. A superconducting circuit allows to both inject and measure entangled singlet electron pairs in an array of three normal quantum dots. The selection of the teleportation process is achieved in the steady state with the help of two superconducting dots and appropriate gating. Teleportation of the electron spin is detected by measuring the spin-polarized current through the normal dot array. This current is perfectly correlated to the pair current flowing inside the superconducting circuit. The classical channel required by Bennett's protocol, which signals the completion of a teleportation cycle, is identified with the detection of an electron charge in the superconducting circuit.
Quantum information science has the potential to revolutionize modern technology by providing resource-efficient approaches to computing. Quantum communication explores how superposition and entanglement can protect and transmit quantum information. Quantum teleportation, in which the quantum state of one system is transmitted to another, is a fundamental example of quantum communication. Here, we demonstrate a new way to transmit quantum spin states based on the Heisenberg interaction between electrons in solids. We teleport the spin state of an electron back and forth along a chain of electrons in a quantum-dot array without moving any electrons. We also demonstrate that this Heisenberg spin teleport is compatible with entangled states. This spin teleport may be especially useful for spin-based quantum information processing, where the transmission of quantum spin states across large quantum-dot arrays will be beneficial for universal quantum computation. This Heisenberg spin teleport also provides a striking example of the strange and interesting phenomena enabled by the laws of quantum physics.
We present a model of quantum teleportation protocol based on a double quantum dot array. The unknown qubit is encoded using a pair of quantum dots, with one excess electron, coupled by tunneling. It is shown how to create a maximally entangled state using an adiabatically increasing Coulomb repulsion between different dot pairs. This entangled state is exploited to perform teleportation again using an adiabatic coupling between itself and the incoming unknown state. Finally, a sudden separation of Bob’s qubit allows a time evolution of Alice’s which amounts to a modified version of standard Bell measurement. A transmission over a long distance could be obtained by considering the entangled state of a chain of N coupled double quantum dots. The system is shown to be increasingly robust with N against decoherence due to phonons.