2007/10/31 by Grzegorz Chimczak, Ryszard Tanaś, R. Tanaś · 3 citations
Computer Science · Physics and Astronomy · #Laser-Matter Interactions and Applications #Quantum Information and Cryptography #Quantum optics and atomic interactions #quant-ph
paper · pdf · doi:10.1103/physreva.77.032312
published as Phys. Rev. A 77, 032312 (2008) · 11 pages, 11 figures, published version
openalex publication_date 2008/03/07 · arxiv created 2008/03/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A scheme for fine tuning of quantum operations to improve their performance is proposed. A quantum system in \ensuremathΛ configuration with two-photon Raman transitions is considered without adiabatic elimination of the excited (intermediate) state. Conditional dynamics of the system is studied with focus on improving fidelity of quantum operations. In particular, the \ensuremathπ pulse and \ensuremathπ∕2 pulse quantum operations are considered. The dressed states for the atom-field system, with an atom driven on one transition by a classical field and on the other by a quantum cavity field, are found. A discrete set of detunings is given for which high fidelity of desired states is achieved. Analytical solutions for the quantum state amplitudes are found in the first order perturbation theory with respect to the cavity damping rate \ensuremathκ and the spontaneous emission rate \ensuremathγ. Numerical solutions for higher values of \ensuremathκ and \ensuremathγ indicate a stabilizing role of spontaneous emission in the \ensuremathπ and \ensuremathπ∕2 pulse quantum operations. The idea can also be applied for excitation pulses of different shapes.