dorsal/arxiv
View SchemaA Self Assembled Nanoelectronic Quantum Computer Based on the Rashba Effect in Quantum Dots
| Authors | Supriyo Bandyopadhyay |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9910032 |
| URL | https://arxiv.org/abs/quant-ph/9910032 |
| DOI | 10.1103/PhysRevB.61.13813 |
| Journal | Physical Review B, Vol. 61, 13813 (2000) |
Abstract
Quantum computers promise vastly enhanced computational power and an uncanny ability to solve classically intractable problems. However, few proposals exist for robust, solid state implementation of such computers where the quantum gates are sufficiently miniaturized to have nanometer-scale dimensions. Here I present a new approach whereby a complete computer with nanoscale gates might be self-assembled using chemical synthesis. Specifically, I demonstrate how to self-assemble the fundamental unit of this quantum computer - a 2-qubit universal quantum controlled-NOT gate - based on two exchange coupled multilayered quantum dots. Then I show how these gates can be wired using thiolated conjugated molecules as electrical connectors. A qubit is encoded in the ground state of a quantum dot spin-split by the Rashba interaction. Arbitrary qubit rotations are effected by bringing the spin splitting energy in a target quantum dot in resonance with a global ac magnetic field by applying a potential pulse of appropriate amplitude and duration to the dot. The controlled dynamics of the 2-qubit controlled-NOT operation (XOR) can be realized by exploiting the exchange coupling with the nearest neighboring dot. A complete prescription for initialization of the computer and data input/output operations is presented.
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"abstract": "Quantum computers promise vastly enhanced computational power and an uncanny\nability to solve classically intractable problems. However, few proposals exist\nfor robust, solid state implementation of such computers where the quantum\ngates are sufficiently miniaturized to have nanometer-scale dimensions. Here I\npresent a new approach whereby a complete computer with nanoscale gates might\nbe self-assembled using chemical synthesis. Specifically, I demonstrate how to\nself-assemble the fundamental unit of this quantum computer - a 2-qubit\nuniversal quantum controlled-NOT gate - based on two exchange coupled\nmultilayered quantum dots. Then I show how these gates can be wired using\nthiolated conjugated molecules as electrical connectors. A qubit is encoded in\nthe ground state of a quantum dot spin-split by the Rashba interaction.\nArbitrary qubit rotations are effected by bringing the spin splitting energy in\na target quantum dot in resonance with a global ac magnetic field by applying a\npotential pulse of appropriate amplitude and duration to the dot. The\ncontrolled dynamics of the 2-qubit controlled-NOT operation (XOR) can be\nrealized by exploiting the exchange coupling with the nearest neighboring dot.\nA complete prescription for initialization of the computer and data\ninput/output operations is presented.",
"arxiv_id": "quant-ph/9910032",
"authors": [
"Supriyo Bandyopadhyay"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevB.61.13813",
"journal_ref": "Physical Review B, Vol. 61, 13813 (2000)",
"title": "A Self Assembled Nanoelectronic Quantum Computer Based on the Rashba Effect in Quantum Dots",
"url": "https://arxiv.org/abs/quant-ph/9910032"
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