Browsing by Author "Il’ichev, Evgeni"
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- ItemToroidal qubits: Naturally-decoupled quiet artificial atoms([London] : Macmillan Publishers Limited, part of Springer Nature, 2015) Zagoskin, Alexandre M.; Chipouline, Arkadi; Il’ichev, Evgeni; Johansson, J. Robert; Nori, FrancoThe requirements of quantum computations impose high demands on the level of qubit protection from perturbations; in particular, from those produced by the environment. Here we propose a superconducting flux qubit design that is naturally protected from ambient noise. This decoupling is due to the qubit interacting with the electromagnetic field only through its toroidal moment, which provides an unusual qubit-field interaction, which is suppressed at low frequencies.
- ItemUniversal Tool for Single-Photon Circuits: Quantum Router Design(Basel : MDPI, 2020) Sultanov, Aydar; Greenberg, Yakov; Mutsenik, Evgeniya; Pitsun, Dmitry; Il’ichev, EvgeniWe demonstrate that the non-Hermitian Hamiltonian approach can be used as a universal tool to design and describe a performance of single photon quantum electrodynamical circuits (cQED). As an example of the validity of this method, we calculate a novel six port quantum router, constructed from four qubits and three open waveguides. We have obtained analytical expressions, which describe the transmission and reflection coefficients of a single photon in general form taking into account the spread qubit’s parameters. We show that, due to naturally derived interferences, in situ tuning the probability of photon detection in desired ports