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|Title:||Validity of resonant two-qubit gates in the ultrastrong coupling regime of circuit quantum electrodynamics|
|Source:||Wang, Y.M., Ballester, D., Romero, G., Scarani, V., Solano, E. (2012-02). Validity of resonant two-qubit gates in the ultrastrong coupling regime of circuit quantum electrodynamics. Physica Scripta (T147) : -. ScholarBank@NUS Repository. https://doi.org/T147/014031|
|Abstract:||We investigate theoretically the performance of resonant two-qubit gates in the crossover from the strong to the ultrastrong coupling regime of lightmatter interaction in circuit quantum electrodynamics. Two controlled-phase (CPHASE) gate schemeswhich work well within the rotating wave-approximationare analysed while taking into account the effects of counter-rotating terms appearing in the Hamiltonian. Our numerical results show that the fidelity of the gate operation is above 96% when the ratio between the coupling strength and the resonator frequency, g/ r, is about 10%. Novel schemes are required in order to implement ultrafast quantum gates when increasing the ratio g/ r. © 2012 The Royal Swedish Academy of Sciences.|
|Source Title:||Physica Scripta|
|Appears in Collections:||Staff Publications|
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