Zobrazeno 1 - 10
of 41
pro vyhledávání: '"CARLINI, ALBERTO"'
Publikováno v:
Phys. Rev. A 98, 052125 (2018)
Quantum coherence inherently affects the dynamics and the performances of a quantum machine. Coherent control can, at least in principle, enhance the work extraction and boost the velocity of evolution in an open quantum system. Using advanced tools
Externí odkaz:
http://arxiv.org/abs/1807.07450
Publikováno v:
Phys. Rev. A 98, 012139 (2018)
We apply advanced methods of control theory to open quantum systems and we determine finite-time processes which are optimal with respect to thermodynamic performances. General properties and necessary conditions characterizing optimal drivings are d
Externí odkaz:
http://arxiv.org/abs/1709.07400
Publikováno v:
Uther Shackerley-Bennett et al 2017 Quantum Sci. Technol. 2 044014
The relaxation of a system to a steady state is a central point of interest in many attempts to advance control over the quantum world. In this paper, we consider control through instantaneous Gaussian unitary operations on the ubiquitous lossy chann
Externí odkaz:
http://arxiv.org/abs/1702.00639
Publikováno v:
Phys. Rev. A 90 (2014), 052324
We consider the problem of time optimal control of a continuous bosonic quantum system subject to the action of a Markovian dissipation. In particular, we consider the case of a one mode Gaussian quantum system prepared in an arbitrary initial state
Externí odkaz:
http://arxiv.org/abs/1409.7342
Autor:
Mukherjee, Victor, Carlini, Alberto, Mari, Andrea, Caneva, Tommaso, Montangero, Simone, Calarco, Tommaso, Fazio, Rosario, Giovannetti, Vittorio
Publikováno v:
Phys. Rev. A 88, 062326 (2013)
We consider a two-level quantum system prepared in an arbitrary initial state and relaxing to a steady state due to the action of a Markovian dissipative channel. We study how optimal control can be used for speeding up or slowing down the relaxation
Externí odkaz:
http://arxiv.org/abs/1307.7964
Publikováno v:
Phys. Rev. A 75, 042308 (2007)
Extending our previous work on time optimal quantum state evolution, we formulate a variational principle for the time optimal unitary operation, which has direct relevance to quantum computation. We demonstrate our method with three examples, i.e. t
Externí odkaz:
http://arxiv.org/abs/quant-ph/0608039
Publikováno v:
Phys. Rev. Lett. 96, 060503 (2006)
We present a general framework for finding the time-optimal evolution and the optimal Hamiltonian for a quantum system with a given set of initial and final states. Our formulation is based on the variational principle and is analogous to that for th
Externí odkaz:
http://arxiv.org/abs/quant-ph/0511039
Autor:
Sasaki, Masahide, Carlini, Alberto
Publikováno v:
Phys. Rev. A66, 022303 (2002).
Suppose that three kinds of quantum systems are given in some unknown states $\ket f^{\otimes N}$, $\ket{g_1}^{\otimes K}$, and $\ket{g_2}^{\otimes K}$, and we want to decide which \textit{template} state $\ket{g_1}$ or $\ket{g_2}$, each representing
Externí odkaz:
http://arxiv.org/abs/quant-ph/0202173
Autor:
Carlini, Alberto, Martellini, Maurizio
Publikováno v:
Phys.Lett. B276 (1992) 36-40
We use the 5-th time action formalism introduced by Halpern and Greensite to stabilize the unbounded Euclidean 4-D gravity in two simple minisuperspace models. In particular, we show that, at the semiclassical level ($\hbar \rightarrow 0$), we still
Externí odkaz:
http://arxiv.org/abs/hep-th/9201042
Autor:
Carlini, Alberto, Martellini, Maurizio
Publikováno v:
Class.Quant.Grav.9:629-640,1992
We here calculate the one-loop approximation to the Euclidean Quantum Gravity coupled to a scalar field around the classical Carlini and Miji\'c wormhole solutions. The main result is that the Euclidean partition functional $Z_{EQG}$ in the ``little
Externí odkaz:
http://arxiv.org/abs/hep-th/9201043