dorsal/arxiv
View SchemaRobust Quantum Computation with Quantum Dots
| Authors | C. Stephen Hellberg |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0304150 |
| URL | https://arxiv.org/abs/quant-ph/0304150 |
Abstract
Quantum computation in solid state quantum dots faces two significant challenges: Decoherence from interactions with the environment and the difficulty of generating local magnetic fields for the single qubit rotations. This paper presents a design of composite qubits to overcome both challenges. Each qubit is encoded in the degenerate ground-state of four (or six) electrons in a system of five quantum dots arranged in a two-dimensional pattern. This decoherence-free subspace is immune to both collective and local decoherence, and resists other forms of decoherence, which must raise the energy. The gate operations for universal computation are simple and physically intuitive, and are controlled by modifying the tunneling barriers between the dots--Control of local magnetic fields is not required. A controlled-phase gate can be implemented in a single pulse.
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"abstract": "Quantum computation in solid state quantum dots faces two significant\nchallenges: Decoherence from interactions with the environment and the\ndifficulty of generating local magnetic fields for the single qubit rotations.\nThis paper presents a design of composite qubits to overcome both challenges.\nEach qubit is encoded in the degenerate ground-state of four (or six) electrons\nin a system of five quantum dots arranged in a two-dimensional pattern. This\ndecoherence-free subspace is immune to both collective and local decoherence,\nand resists other forms of decoherence, which must raise the energy. The gate\noperations for universal computation are simple and physically intuitive, and\nare controlled by modifying the tunneling barriers between the dots--Control of\nlocal magnetic fields is not required. A controlled-phase gate can be\nimplemented in a single pulse.",
"arxiv_id": "quant-ph/0304150",
"authors": [
"C. Stephen Hellberg"
],
"categories": [
"quant-ph",
"cond-mat.str-el"
],
"title": "Robust Quantum Computation with Quantum Dots",
"url": "https://arxiv.org/abs/quant-ph/0304150"
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