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10 papers · 2 filters
Communication in quantum networks of logical bus topology
T. Brougham, G. M. Nikolopoulos, I. Jex
Perfect state transfer (PST) is discussed in the context of passive quantum networks with logical bus topology, where many logical nodes communicate using the same shared media, wi…
Photons Walking the Line: A quantum walk with adjustable coin operations
A. Schreiber, K. N. Cassemiro, V. Potocek +5
We present the first robust implementation of a coined quantum walk over five steps using only passive optical elements. By employing a fiber network loop we keep the amount of req…
Asymptotic Evolution of Random Unitary Operations
J. Novotny, G. Alber, I. Jex
We analyze the asymptotic dynamics of quantum systems resulting from large numbers of iterations of random unitary operations. Although, in general, these quantum operations cannot…
Spectral filtering in quantum Y-junction
Taksu Cheon, Pavel Exner, Ondrej Turek
We examine scattering properties of singular vertex of degree and , taking advantage of a new form of representing the vertex boundary condition, which has been devised…
Approximation of a general singular vertex coupling in quantum graphs
Taksu Cheon, Pavel Exner, Ondrej Turek
The longstanding open problem of approximating all singular vertex couplings in a quantum graph is solved. We present a construction in which the edges are decoupled; an each pair…
Transformation design and nonlinear Hamiltonians
Thomas Brougham, Goce Chadzitaskos, Igor Jex
We study a class of nonlinear Hamiltonians, with applications in quantum optics. The interaction terms of these Hamiltonians are generated by taking a linear combination of powers…