dorsal/arxiv
View SchemaQuantum phase estimation algorithms with delays: effects of dynamical phases
| Authors | L. F. Wei, Franco Nori |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0305038 |
| URL | https://arxiv.org/abs/quant-ph/0305038 |
| DOI | 10.1088/0305-4470/37/16/010 |
| Journal | J. Phys. A, 37, 4607 (2004) |
Abstract
The unavoidable finite time intervals between the sequential operations needed for performing practical quantum computing can degrade the performance of quantum computers. During these delays, unwanted relative dynamical phases are produced due to the free evolution of the superposition wave-function of the qubits. In general, these coherent "errors" modify the desired quantum interferences and thus spoil the correct results, compared to the ideal standard quantum computing that does not consider the effects of delays between successive unitary operations. Here, we show that, in the framework of the quantum phase estimation algorithm, these coherent phase "errors", produced by the time delays between sequential operations, can be avoided by setting up the delay times to satisfy certain matching conditions.
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"abstract": "The unavoidable finite time intervals between the sequential operations\nneeded for performing practical quantum computing can degrade the performance\nof quantum computers. During these delays, unwanted relative dynamical phases\nare produced due to the free evolution of the superposition wave-function of\nthe qubits. In general, these coherent \"errors\" modify the desired quantum\ninterferences and thus spoil the correct results, compared to the ideal\nstandard quantum computing that does not consider the effects of delays between\nsuccessive unitary operations. Here, we show that, in the framework of the\nquantum phase estimation algorithm, these coherent phase \"errors\", produced by\nthe time delays between sequential operations, can be avoided by setting up the\ndelay times to satisfy certain matching conditions.",
"arxiv_id": "quant-ph/0305038",
"authors": [
"L. F. Wei",
"Franco Nori"
],
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"quant-ph"
],
"doi": "10.1088/0305-4470/37/16/010",
"journal_ref": "J. Phys. A, 37, 4607 (2004)",
"title": "Quantum phase estimation algorithms with delays: effects of dynamical phases",
"url": "https://arxiv.org/abs/quant-ph/0305038"
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