The More You Know: Loss-DiVicenzo Quantum Computer

The Loss-DiVicenzo Quantum Computer is a hardware proposal for the implementation of a scalable spin-based quantum computer in a coupled quantum dot system. The qubits of their quantum computer are realized as the two spin states of a confined electron.

In this proposal, initialization is achieved by applying a strong magnetic field and letting the electrons reach their thermodynamic ground state. Single-qubit operations are performed by varying the effective Zeeman interaction on each dot individually.

Two-qubit quantum gate operations are performed by controlling the electrostatic barrier between neighbouring quantum dots. Thus, if the barrier potential is high, the electrons cannot tunnel from one quantum dot to another and the spins are decoupled. When the barrier is pulsed to a low voltage, the two electron wave functions overlap and the spins will be subject to a non-zero Heisenberg exchange coupling:

H_{s}(t)=J(t)\vec{S}_1\cdot\vec{S}_2.

Finally, readout could be performed using spin-to-charge conversion (high-fidelity, single-shot electron charge detection).

Go to the Dictionary of Quantum Information and Quantum Computation.


References:

[1] “Quantum Computation with Quantum Dots”, D. Lossa, and D. P. DiVincenzo. arXiv:cond-mat/9701055

 All text copyright © Marco Vinicio Sebastian Cerezo de la Roca.

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The More You Know: Loss-DiVicenzo Quantum Computer by Marco Vinicio Sebastian Cerezo de la Roca is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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About marcocerezo

My name is Marco Cerezo, I have a degree in physics from the Universidad Nacional de la Plata (UNLP) in Buenos Aires, Argentina, and I'm a Ph.D student. Although I study in Argentina, I was born and raised in Guatemala, so I consider myself "chapín" at heart. From an early age I discovered how exciting, interesting and fun physics can be, so I decided to devote myself to study this passionate field. This blog is dedicated to all those who want to dig a little into the mysteries and beauty of physics. And in particular, to all those who are interested in studying Quantum Computation and Quantum Information. ---------------------------------------------------------------------------------------------------------- Mi nombre es Marco Cerezo, Licenciado en Física egresado de la Universidad Nacional de la Plata (UNLP) en Buenos Aires, Argentina. Actualmente estoy haciendo mi Doctorado en física. Aunque estudio en Argentina, nací y crecí en Guatemala por lo que me considero chapín de corazón. Desde muy temprana edad descubrí lo apasionante, interesante y divertida que es la física por lo que decidí dedicarme a su estudio. Este blog es está dedicado a todos aquellos que quieren indagar un poco en los misterios y la belleza de la física; y en particular, a aquellos que quieran aprender sobre Computación e Información Cuántica.
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