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37 papers · 1 filter
The norm-1-property of a quantum observable
T. Heinonen, P. Lahti, J. -P. Pellonpaa +2
A normalized positive operator measure has the norm-1-property if $\no{E(X)}=1$ whenever . This property reflects the fact that the measurement outcome p…
The statistical mechanics of the classical two-dimensional Coulomb gas is exactly solved
L. Samaj
The model under consideration is a classical 2D Coulomb gas of pointlike positive and negative unit charges, interacting via a logarithmic potential. In the whole stability range o…
Evolution of quantum systems with a scaling type of time-dependent Hamiltonians
L. Samaj
We introduce a new class of quantum models with time-dependent Hamiltonians of a special scaling form. By using a couple of time-dependent unitary transformations, the time evoluti…
Realistic fast quantum gates with hot trapped ions
Marek Sasura, Andrew M. Steane
The "pushing gate" proposed by Cirac and Zoller in 2000 for quantum logic in ion traps is discussed, in which a force is used to give a controlled push to a pair of trapped ions an…
Point-contact spectroscopy of MgB2
P. Samuely, P. Szabo, J. Kacmarcik +2
Point-contact spectroscopy measurements on magnesium diboride reveal the existence of two superconducting energy gaps closing at the same transition temperature in line with the mu…
Entangled graphs: Bipartite entanglement in multi-qubit systems
Martin Plesch, Vladimir Buzek
Quantum entanglement in multipartite systems cannot be shared freely. In order to illuminate basic rules of entanglement sharing between qubits we introduce a concept of an entangl…