Conditions for superdecoherence
Decoherence is the main obstacle to quantum computation. The decoherence rate per qubit is typically assumed to be constant. It is known, however, that quantum registers coupling to a single reservoir can show a decoherence rate per qubit that increases linearly with the number of qubits. This effec...
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| Format: | Article |
| Language: | English |
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Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften
2020-05-01
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| Series: | Quantum |
| Online Access: | https://quantum-journal.org/papers/q-2020-05-14-265/pdf/ |
| _version_ | 1819266347834540032 |
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| author | Joris Kattemölle Jasper van Wezel |
| author_facet | Joris Kattemölle Jasper van Wezel |
| author_sort | Joris Kattemölle |
| collection | DOAJ |
| description | Decoherence is the main obstacle to quantum computation. The decoherence rate per qubit is typically assumed to be constant. It is known, however, that quantum registers coupling to a single reservoir can show a decoherence rate per qubit that increases linearly with the number of qubits. This effect has been referred to as superdecoherence, and has been suggested to pose a threat to the scalability of quantum computation. Here, we show that superdecoherence is absent when the spectrum of the single reservoir is continuous, rather than discrete. The reason of this absence, is that, as the number of qubits is increased, a quantum register inevitably becomes susceptible to an ever narrower bandwidth of frequencies in the reservoir. Furthermore, we show that for superdecoherence to occur in a reservoir with a discrete spectrum, one of the frequencies in the reservoir has to coincide exactly with the frequency the quantum register is most susceptible to. We thus fully resolve the conditions that determine the presence or absence of superdecoherence. We conclude that superdecoherence is easily avoidable in practical realizations of quantum computers. |
| first_indexed | 2024-12-23T20:59:50Z |
| format | Article |
| id | doaj.art-4c06b5783fc14d7598dcb976aab8d255 |
| institution | Directory Open Access Journal |
| issn | 2521-327X |
| language | English |
| last_indexed | 2024-12-23T20:59:50Z |
| publishDate | 2020-05-01 |
| publisher | Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften |
| record_format | Article |
| series | Quantum |
| spelling | doaj.art-4c06b5783fc14d7598dcb976aab8d2552022-12-21T17:31:24ZengVerein zur Förderung des Open Access Publizierens in den QuantenwissenschaftenQuantum2521-327X2020-05-01426510.22331/q-2020-05-14-26510.22331/q-2020-05-14-265Conditions for superdecoherenceJoris KattemölleJasper van WezelDecoherence is the main obstacle to quantum computation. The decoherence rate per qubit is typically assumed to be constant. It is known, however, that quantum registers coupling to a single reservoir can show a decoherence rate per qubit that increases linearly with the number of qubits. This effect has been referred to as superdecoherence, and has been suggested to pose a threat to the scalability of quantum computation. Here, we show that superdecoherence is absent when the spectrum of the single reservoir is continuous, rather than discrete. The reason of this absence, is that, as the number of qubits is increased, a quantum register inevitably becomes susceptible to an ever narrower bandwidth of frequencies in the reservoir. Furthermore, we show that for superdecoherence to occur in a reservoir with a discrete spectrum, one of the frequencies in the reservoir has to coincide exactly with the frequency the quantum register is most susceptible to. We thus fully resolve the conditions that determine the presence or absence of superdecoherence. We conclude that superdecoherence is easily avoidable in practical realizations of quantum computers.https://quantum-journal.org/papers/q-2020-05-14-265/pdf/ |
| spellingShingle | Joris Kattemölle Jasper van Wezel Conditions for superdecoherence Quantum |
| title | Conditions for superdecoherence |
| title_full | Conditions for superdecoherence |
| title_fullStr | Conditions for superdecoherence |
| title_full_unstemmed | Conditions for superdecoherence |
| title_short | Conditions for superdecoherence |
| title_sort | conditions for superdecoherence |
| url | https://quantum-journal.org/papers/q-2020-05-14-265/pdf/ |
| work_keys_str_mv | AT joriskattemolle conditionsforsuperdecoherence AT jaspervanwezel conditionsforsuperdecoherence |