Searched for: author%3A%22Blaauboer%2C+M.%22
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Zhang, Xiang (author), Blaauboer, M. (author)
We theoretically investigate the enhancement of the charging power in a Dicke quantum battery which consists of an array of N two-level systems (TLS)coupled to a single mode of cavity photons. In the limit of small N, we analytically solve the time evolution for the full charging process. The eigenvectors of the driving Hamiltonian are found...
journal article 2023
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Nagtegaal, M.A. (author), Blaauboer, M. (author)
We propose a quantum-mechanical device consisting of transmon qubits connected to single-photon transmission lines that can be used to perform a boolean quantum private query on a database. Using numerical simulations verified by analytical calculations we analyse the dynamics of the query process in the proposed system by calculating the...
journal article 2019
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Hageman, J. (author), Blaauboer, M. (author)
We theoretically investigate the effect of transverse magnetic anisotropy on spin-flip assisted tunneling through atomic-spin chains. Using a phenomenological approach and first-order perturbation theory, we analytically calculate the inelastic tunneling current, differential conductance, and atomic-spin transition rates. We predict the...
journal article 2017
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Blok, S. (author), Agundez Mojarro, R.R. (author), Maduro, L. A. (author), Blaauboer, M. (author), Van Der Molen, S. J. (author)
We investigate inelastic cotunneling in a model system where the charging island is connected to the leads through molecules with energy-dependent transmission functions. To study this problem, we propose two different approaches. The first is a pragmatic approach that assumes Lorentzian-like transmission functions that determine the...
journal article 2017
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Agundez Mojarro, R.R. (author), Hill, C. D. (author), Hollenberg, L.C.L (author), Rogge, S. (author), Blaauboer, M. (author)
In this paper we propose a superadiabatic protocol where quantum state transfer can be achieved with arbitrarily high accuracy and minimal control across long spin chains with an odd number of spins. The quantum state transfer protocol only requires the control of the couplings between the qubits on the edge and the spin chain. We predict...
journal article 2017
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Sala, Arnau (author), Blaauboer, M. (author)
We propose an implementation of a quantum router for microwave photons in a superconducting qubit architecture consisting of a transmon qubit, SQUIDs and a nonlinear capacitor. We model and analyze the dynamics of operation of the quantum switch using quantum Langevin equations in a scattering approach and compute the photon reflection and...
journal article 2016
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Agundez Mojarro, R.R. (author), Salfi, J. (author), Rogge, S. (author), Blaauboer, M. (author)
We study the effect of disorder in strongly interacting small atomic chains. Using the Kotliar-Ruckenstein slave-boson approach, we diagonalize the Hamiltonian via scattering matrix theory. We numerically solve the Kondo transmission and the slave-boson parameters that allow us to calculate the Kondo temperature. We demonstrate that in the weak...
journal article 2015
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Alos-Palop, M. (author), Tiwari, R.P. (author), Blaauboer, M. (author)
We investigate adiabatic quantum pumping of chiral Majorana states in a system composed of two Mach-Zehnder type interferometers coupled via a quantum point contact. The pumped current is generated by periodic modulation of the phases accumulated by traveling around each interferometer. Using scattering matrix formalism we show that the pumped...
journal article 2014
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Agundez, R.R. (author), Verduijn, J. (author), Rogge, S. (author), Blaauboer, M. (author)
We investigate the Fano-Kondo interplay in an Aharonov-Bohm ring with an embedded noninteracting quantum dot and a Coulomb interacting quantum dot. Using a slave-boson mean-field approximation we diagonalize the Hamiltonian via scattering matrix theory and derive the conductance in the form of a Fano expression, which depends on the mean-field...
journal article 2013
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Alos Palop, M. (author), Tiwari, R.P. (author), Blaauboer, M. (author)
We investigate quantum transport via surface states in a nanostep junction on the surface of a three-dimensional topological insulator that involves two different side surfaces. We calculate the conductance across the junction within the scattering matrix formalism and find that as the bias voltage is increased, the conductance of the nanostep...
journal article 2013
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Alos-Palop, M. (author), Tiwari, R.P. (author), Blaauboer, M. (author)
We investigate adiabatic quantum pumping of ballistic Dirac fermions on the surface of a strong three-dimensional topological insulator. Two different geometries are studied in detail, a normal metal–ferromagnetic–normal metal (NFN) junction and a ferromagnetic–normal metal–ferromagnetic (FNF) junction. Using a scattering matrix approach, we...
journal article 2012
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Wakker, G.M.M. (author), Ockhorst, R. (author), Blaauboer, M. (author)
We investigate an extended version of the quantum Ising model which includes beyond-nearest-neighbor interactions and an additional site-dependent longitudinal magnetic field. Treating the interaction exactly and using perturbation theory in the longitudinal field, we calculate the energy spectrum and find that the presence of beyond-nearest...
journal article 2012
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Tettamanzi, G.C. (author), Verduijn, J. (author), Lansbergen, G.P. (author), Blaauboer, M. (author), Calderón, M.J. (author), Aguado, R. (author), Rogge, S. (author)
Semiconductor devices have been scaled to the point that transport can be dominated by only a single dopant atom. As a result, in a Si fin-type field effect transistor Kondo physics can govern transport when one electron is bound to the single dopant. Orbital (valley) degrees of freedom, apart from the standard spin, strongly modify the Kondo...
journal article 2012
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Wakker, G.M.M. (author), Tiwari, R.P. (author), Blaauboer, M. (author)
We calculate the energy spectrum and eigenstates of a graphene sheet that contains a circular deformation. Using time-independent perturbation theory with the ratio of the height and width of the deformation as the small parameter, we find that due to the curvature the wave functions for the various states acquire unique angular asymmetry.We...
journal article 2011
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Alos-Palop, M. (author), Blaauboer, M. (author)
We investigate adiabatic quantum pumping through a normal-metal–“insulator”–superconductor (NIS) junction in a monolayer of graphene. The pumped current is generated by periodic modulation of two gate voltages, applied to the insulating and superconducting regions, respectively. In the bilinear response regime and in the limit of a thin high...
journal article 2011
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Borras, A. (author), Blaauboer, M. (author)
We propose a scheme for detecting entanglement between two-electron spin qubits in a double quantum dot using an entanglement witness operator. We first calculate the optimal configuration of the two electron spins, defined as the position in the energy level spectrum where, averaged over the nuclear spin distribution, (1) the probability to...
journal article 2011
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Tiwari, R.P. (author), Blaauboer, M. (author)
We consider quantum pumping of Dirac fermions in a monolayer of graphene in the presence of a perpendicular magnetic field in the central pumping region. The two external pump parameters are electrical voltages applied to the graphene sheet on either side of the pumping region. We analyze this pump within scattering matrix formalism and...
journal article 2010
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Wakker, G.M.M. (author), Blaauboer, M. (author)
We investigate quantum pumping of massless Dirac fermions in an ideal (impurity free) double layer of graphene. The pumped current is generated by adiabatic variation in two gate voltages in the contact regions to a weakly doped double graphene sheet. At the Dirac point and for a wide bilayer with width W?length L, we find that the pumped...
journal article 2010
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Blaauboer, M. (author)
conference paper 2010
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Bodoky, F. (author), Gühne, O. (author), Blaauboer, M. (author)
We investigate the time evolution of entanglement under various models of decoherence: a general heuristic model based on local relaxation and dephasing times, and two microscopic models describing decoherence of electron spin qubits in quantum dots due to the hyperfine interaction with the nuclei. For each of the decoherence models, we...
journal article 2009
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