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Adiabatic dynamics of a quantum critical system coupled to an environment: Scaling and kinetic equation approaches
Dario Patanè, Alessandro Silva, Luigi Amico +2
We study the dynamics of open quantum many-body systems driven across a critical point by quenching an Hamiltonian parameter at a certain velocity. General scaling laws are derived…
Trap modulation spectroscopy of the Mott-insulator transition in optical lattices
H. Lignier, A. Zenesini, D. Ciampini +5
We introduce a new technique to probe the properties of an interacting cold atomic gas that can be viewed as a dynamical compressibility measurement. We apply this technique to the…
Optimized single-qubit gates for Josephson phase qubits
Shabnam Safaei, Simone Montangero, Fabio Taddei +1
In a Josephson phase qubit the coherent manipulations of the computational states are achieved by modulating an applied ac current, typically in the microwave range. In this work w…
Dipole oscillations of confined lattice bosons in one dimension
Simone Montangero, Rosario Fazio, Peter Zoller +1
We study the dynamics of a non-integrable system comprising interacting cold bosons trapped in an optical lattice in one-dimension by means of exact time-dependent numerical DMRG t…
Critical exponents of one-dimensional quantum critical models by means of MERA tensor network
S. Montangero, M. Rizzi, V. Giovannetti +1
An algorithm for optimizing the MERA tensor network in an infinite system is presented. Using this technique we compute the critical exponents of Ising and XXZ model.
Entanglement of Electrons Field-Emitted from a Superconductor
Kazuya Yuasa, Paolo Facchi, Rosario Fazio +4
Under appropriate circumstances the electrons emitted from a superconducting tip can be entangled. We analyze these nonlocal correlations by studying the coincidences of the field-…
Andreev reflection in graphene nanoribbons
Diego Rainis, Fabio Taddei, Fabrizio Dolcini +2
We study Andreev reflection in graphene nanoribbon/superconductor hybrid junctions. By using a tight-binding approach and the scattering formalism we show that finite-size effects…
Photon and polariton fluctuations in arrays of QED-cavities
Davide Rossini, Rosario Fazio, Giuseppe Santoro
We propose to detect the Mott insulator-superfluid quantum phase transition in an array of coupled cavities by studying the polariton and photon fluctuations in a block of linear d…
Adiabatic quantum dynamics of the Lipkin-Meshkov-Glick model
Tommaso Caneva, Rosario Fazio, Giuseppe E. Santoro
The adiabatic quantum evolution of the Lipkin-Meshkov-Glick (LMG) model across its quantum critical point is studied. The dynamics is realized by linearly switching the transverse…
Geometric effects of noise on Cooper pair pumping
Valentina Brosco, Alexander Shnirman, Rosario Fazio
Several works investigated the connection between Cooper pair pumping and the geometric and topological properties of the pumping cycle in the parameters space. Recently the predic…
Phase-Dependent Electronic Specific Heat in Mesoscopic Josephson Junctions
H. Rabani, F. Taddei, O. Bourgeois +2
We study the influence of superconducting correlations on the electronic specific heat in a diffusive superconductor-normal metal-superconductor Josephson junction. We present a de…
Coulomb-interaction effects in full counting statistics of a quantum-dot Aharonov-Bohm interferometer
Daniel Urban, Jürgen König, Rosario Fazio
We study the effect of Coulomb interaction on the full counting statistics of an Aharonov-Bohm (AB) interferometer with a single-level quantum dot in one arm in the regime of weak…
Adiabatic dynamics in open quantum critical many-body systems
Dario Patanè, Alessandro Silva, Luigi Amico +2
The purpose of this work is to understand the effect of an external environment on the adiabatic dynamics of a quantum critical system. By means of scaling arguments we derive a ge…
Quantum MERA Channels
Vittorio Giovannetti, Simone Montangero, Rosario Fazio
Tensor networks representations of many-body quantum systems can be described in terms of quantum channels. We focus on channels associated with the Multi-scale Entanglement Renorm…
Bang-Bang control of a qubit coupled to a quantum critical spin bath
Davide Rossini, Paolo Facchi, Rosario Fazio +5
We analytically and numerically study the effects of pulsed control on the decoherence of a qubit coupled to a quantum spin bath. When the environment is critical, decoherence is f…
Adiabatic quenches through an extended quantum critical region
Franco Pellegrini, Simone Montangero, Giuseppe E. Santoro +1
By gradually changing the degree of the anisotropy in a XXZ chain we study the defect formation in a quantum system that crosses an extended critical region. We discuss two qualita…
Optimized Cooper pair pumps
Shabnam Safaei, Simone Montangero, Fabio Taddei +1
In adiabatic Cooper pair pumps, operated by means of gate voltage modulation only, the quantization of the pumped charge during a cycle is limited due to the quantum coherence of t…