Searched for: department%3A%22Kavli%255C%252BInstitute%255C%252Bof%255C%252BNanoscience%22
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Verduijn, J. (author)
doctoral thesis 2012
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De Groot, P.C. (author), Van Loo, A.F. (author), Lisenfeld, J. (author), Schouten, R.N. (author), Lupa?cu, A. (author), Harmans, C.J.P.M. (author), Mooij, J.E. (author)
We present experimental results on the crosstalk between two ac-operated dispersive bifurcation detectors, implemented in a circuit for high-fidelity readout of two strongly coupled flux qubits. Both phase-dependent and phase-independent contributions to the crosstalk are analyzed. For proper tuning of the phase the measured crosstalk is 0.1%...
journal article 2010
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Verduijn, J. (author), Tettamanzi, G.C. (author), Lansbergen, G.P. (author), Collaert, N. (author), Biesemans, S. (author), Rogge, S. (author)
In this letter, we describe the observation of the interference of conduction paths induced by two donors in a nanoscale silicon transistor, resulting in a Fano resonance. This demonstrates the coherent exchange of electrons between two donors. In addition, the phase difference between the two conduction paths can be tuned by means of a magnetic...
journal article 2010
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Nowack, K.C. (author)
doctoral thesis 2009
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Bodoky, F. (author)
The goal of this thesis is to investigate theoretically the generation and behaviour of multipartite entanglement for solid-state nanosystems, in particular electron spin quantum bits (so-called 'qubits') in quantum dots. A quantum dot is a tiny potential well where a single electron can be trapped. A quantum bit can be implemented in this...
doctoral thesis 2009
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Gühne, O. (author), Bodoky, F. (author), Blaauboer, M. (author)
We present a method to determine the decay of multiparticle quantum correlations as quantified by the geometric measure of entanglement under the influence of decoherence. With this, we compare the robustness of entanglement in Greenberger-Horne-Zeilinger (GHZ), cluster, W, and Dicke states of four qubits and show that the Dicke state is the...
journal article 2008
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Picot, T. (author), Lupa?cu, A. (author), Saito, S. (author), Harmans, C.J.P.M. (author), Mooij, J.E. (author)
We analyze the relaxation of a superconducting flux qubit during measurement. The qubit state is measured with a nonlinear oscillator driven across the threshold of bifurcation, acting as a switching dispersive detector. This readout scheme is of quantum nondemolition type. Two successive readouts are used to analyze the evolution of the qubit...
journal article 2008
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Wei, H. (author), Nazarov, Y.V. (author)
We address continuous weak linear quantum measurement and argue that it is best understood in terms of statistics of the outcomes of the linear detectors measuring a quantum system, for example, a qubit. We mostly concentrate on a setup consisting of a qubit and three independent detectors that simultaneously monitor three noncommuting operator...
journal article 2008
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Ashhab, S. (author), Niskanen, A.O. (author), Harrabi, K. (author), Nakamura, Y. (author), Picot, T. (author), De Groot, P.C. (author), Harmans, C.J.P.M. (author), Mooij, J.E. (author), Nori, F. (author)
We consider a system composed of two qubits and a high excitation energy quantum object used to mediate coupling between the qubits. We treat the entire system quantum mechanically and analyze the properties of the eigenvalues and eigenstates of the total Hamiltonian. After reproducing well known results concerning the leading term in the...
journal article 2008
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Eroms, J. (author), Van Schaarenburg, L.C. (author), Driessen, E.F.C. (author), Plantenberg, J.H. (author), Huizinga, C.M. (author), Schouten, R.N. (author), Verbruggen, A.H. (author), Harmans, C.J.P.M. (author), Mooij, J.E. (author)
The authors have studied low-frequency resistance fluctuations in shadow-evaporated Al/AlOx/Al tunnel junctions. Between 300 and 5?K the spectral density follows a 1/f law. Below 5?K, individual defects distort the 1/f shape of the spectrum. The spectral density decreases linearly with temperature between 150 and 1?K and saturates below 0.8?K....
journal article 2006
Searched for: department%3A%22Kavli%255C%252BInstitute%255C%252Bof%255C%252BNanoscience%22
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