dorsal/arxiv
View SchemaDistribution of interference in random quantum algorithms
| Authors | Ludovic Arnaud, Daniel Braun |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0612168 |
| URL | https://arxiv.org/abs/quant-ph/0612168 |
| DOI | 10.1103/PhysRevA.75.062314 |
| Journal | Phys. Rev. A 75, 062314 (2007) |
Abstract
We study the amount of interference in random quantum algorithms using a recently derived quantitative measure of interference. To this end we introduce two random circuit ensembles composed of random sequences of quantum gates from a universal set, mimicking quantum algorithms in the quantum circuit representation. We show numerically that these ensembles converge to the well--known circular unitary ensemble (CUE) for general complex quantum algorithms, and to the Haar orthogonal ensemble (HOE) for real quantum algorithms. We provide exact analytical formulas for the average and typical interference in the circular ensembles, and show that for sufficiently large numbers of qubits a random quantum algorithm uses with probability close to one an amount of interference approximately equal to the dimension of the Hilbert space. As a by-product, we offer a new way of efficiently constructing random operators from the Haar measures of CUE or HOE in a high dimensional Hilbert space using universal sets of quantum gates.
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"abstract": "We study the amount of interference in random quantum algorithms using a\nrecently derived quantitative measure of interference. To this end we introduce\ntwo random circuit ensembles composed of random sequences of quantum gates from\na universal set, mimicking quantum algorithms in the quantum circuit\nrepresentation. We show numerically that these ensembles converge to the\nwell--known circular unitary ensemble (CUE) for general complex quantum\nalgorithms, and to the Haar orthogonal ensemble (HOE) for real quantum\nalgorithms. We provide exact analytical formulas for the average and typical\ninterference in the circular ensembles, and show that for sufficiently large\nnumbers of qubits a random quantum algorithm uses with probability close to one\nan amount of interference approximately equal to the dimension of the Hilbert\nspace. As a by-product, we offer a new way of efficiently constructing random\noperators from the Haar measures of CUE or HOE in a high dimensional Hilbert\nspace using universal sets of quantum gates.",
"arxiv_id": "quant-ph/0612168",
"authors": [
"Ludovic Arnaud",
"Daniel Braun"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.75.062314",
"journal_ref": "Phys. Rev. A 75, 062314 (2007)",
"title": "Distribution of interference in random quantum algorithms",
"url": "https://arxiv.org/abs/quant-ph/0612168"
},
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