dorsal/arxiv
View SchemaOn the effectiveness of the protocol creating the maximum entanglement of two charge-phase qubits by cavity field
| Authors | C. Li, Y. B. Gao |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0410192 |
| URL | https://arxiv.org/abs/quant-ph/0410192 |
Abstract
We revisit the protocols to create maximally entangled states between two Josephson junction (JJ) charge phase qubits coupled to a microwave field in a cavity as a quantum data bus. We devote to analyze a novel mechanism of quantum decoherence due to the adiabatic entanglement between qubits and the data bus, the off-resonance microwave field. We show that even through the variable of the data bus can be adiabatically eliminated, the entanglement between the qubits and data bus remains and can decoher the superposition of two-particle state. Fortunately we can construct a decoherence-free subspace of two-dimension to against this adiabatic decoherence.To carry out the analytic study for this decoherence problem, we develop Fr\H{o}hlich transformation to re-derive the effective Hamiltonian of these system, which is equivalent to that obtained from the adiabatic elimination approach .
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"date_created": "2026-03-02T18:02:13.453000Z",
"date_modified": "2026-03-02T18:02:13.453000Z",
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"abstract": "We revisit the protocols to create maximally entangled states between two\nJosephson junction (JJ) charge phase qubits coupled to a microwave field in a\ncavity as a quantum data bus. We devote to analyze a novel mechanism of quantum\ndecoherence due to the adiabatic entanglement between qubits and the data bus,\nthe off-resonance microwave field. We show that even through the variable of\nthe data bus can be adiabatically eliminated, the entanglement between the\nqubits and data bus remains and can decoher the superposition of two-particle\nstate. Fortunately we can construct a decoherence-free subspace of\ntwo-dimension to against this adiabatic decoherence.To carry out the analytic\nstudy for this decoherence problem, we develop Fr\\H{o}hlich transformation to\nre-derive the effective Hamiltonian of these system, which is equivalent to\nthat obtained from the adiabatic elimination approach .",
"arxiv_id": "quant-ph/0410192",
"authors": [
"C. Li",
"Y. B. Gao"
],
"categories": [
"quant-ph"
],
"title": "On the effectiveness of the protocol creating the maximum entanglement of two charge-phase qubits by cavity field",
"url": "https://arxiv.org/abs/quant-ph/0410192"
},
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"execution_id": "2a919a91-f3d2-4769-8517-f8cb1a16621b",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
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