Fast entanglement of two charge-phase qubits through nonadiabatic coupling to a large junction

Details Fast entanglement of two charge-phase qubits through nonadiabatic coupling to a large junction Fast entanglement of two charge-phase qubits through nonadiabatic coupling to a large junction

2003-07-02

arxiv.org/abs/cond-mat/0307043v4

Physics

Condensed Matter

Superconductivity

5 pages, 1 figure

Scientific paper

10.1103/PhysRevB.70.224515

We propose a theoretical protocol for quantum logic gates between two Josephson junction charge-phase qubits through the control of their coupling to a large junction. In the low excitation limit of the large junction when $E_{J}\gg E_{c}$, it behaves effectively as a quantum data-bus mode of a harmonic oscillator. Our protocol is efficient and fast. In addition, it does not require the data-bus to stay adiabatically in its ground state, as such it can be implemented over a wide parameter regime independent of the data-bus quantum state.

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