Assessment of a quantum phase-gate operation based on nonlinear optics

S. Rebić*, C. Ottaviani, G. Di Giuseppe, D. Vitali, P. Tombesi

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)


    We analyze in detail the proposal for a two-qubit gate for travelling single-photon qubits recently presented by Ottaviani [Phys. Rev. A 73, 010301(R) (2006)]. The scheme is based on an ensemble of five-level atoms coupled to two quantum and two classical light fields. The two quantum fields undergo cross-phase modulation induced by electromagnetically induced transparency. The performance of this two-qubit quantum phase gate for travelling single-photon qubits is thoroughly examined in the steady-state and transient regimes, by means of a full quantum treatment of the system dynamics. In the steady-state regime, we find a general trade-off between the size of the conditional phase shift and the fidelity of the gate operation. However, this trade-off can be bypassed in the transient regime, where a satisfactory gate operation is found to be possible, significantly reducing the gate operation time.

    Original languageEnglish
    Article number032301
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Issue number3
    Publication statusPublished - 2006


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