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53 p, 1.1 MB |
Resource Theory of Heat and Work with Non-commuting Charges
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Khanian, Zahra Baghali (Universitat Autònoma de Barcelona. Departament de Física) ;
Bera, Manabendra Nath (Institut de Ciències Fotòniques) ;
Riera, Arnau (Institut de Ciències Fotòniques) ;
Lewenstein, Maciej (Institució Catalana de Recerca i Estudis Avançats) ;
Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
We consider a theory of quantum thermodynamics with multiple conserved quantities (or charges). To this end, we generalize the seminal results of Sparaciari et al. (Phys. Rev. A 96:052112, 2017) to the case of multiple, in general non-commuting charges, for which we formulate a resource theory of thermodynamics of asymptotically many non-interacting systems. [...]
2023 -  10.1007/s00023-022-01254-1
Annales Henri Poincare, Vol. 24, Issue 5 (May 2023) , p. 1725-1777
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173 p, 4.6 MB |
From Quantum Source Compression to Quantum Thermodynamics
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Baghali Khanian, Zahra ;
Winter, Andreas, dir. ;
Lewenstein, Maciej Andrzej, dir.
Aquesta tesi aborda problemes en el camp de la teoria de la informació quàntica, específicament, la teoria quàntica de Shannon. La primera part de la tesi comença amb definicions concretes de models de fonts quàntiques generals i la seva compressió, i cada capítol següent aborda la compressió d'un model de font específic com a casos especials dels models generals definits inicialment. [...]
Esta tesis aborda problemas en el campo de la teoría de la información cuántica, específicamente, la teoría cuántica de Shannon. La primera parte de la tesis comienza con definiciones concretas de modelos de fuentes cuánticas generales y su compresión, y cada capítulo subsiguiente aborda la compresión de un modelo de fuente específico como casos especiales de los modelos generales definidos inicialmente. [...]
This thesis addresses problems in the field of quantum information theory, specifically, quantum Shannon theory. The first part of the thesis is opened with concrete definitions of general quantum source models and their compression, and each subsequent chapter addresses the compression of a specific source model as a special case of the initially defined general models. [...]
2020
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6 p, 528.3 KB |
Generalized laws of thermodynamics in the presence of correlations
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Bera, Manabendra Nath (Institut de Ciències Fotòniques) ;
Riera, Arnau (Institut de Ciències Fotòniques) ;
Lewenstein, Maciej (Institut de Ciències Fotòniques) ;
Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
The laws of thermodynamics, despite their wide range of applicability, are known to break down when systems are correlated with their environments. Here we generalize thermodynamics to physical scenarios which allow presence of correlations, including those where strong correlations are present. [...]
2017 - 10.1038/s41467-017-02370-x
Nature communications, Vol. 8 (2017) , art. 2180
2 documents
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11 p, 385.0 KB |
Quantum computing in optical microtraps based on the motional states of neutral atoms
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Eckert, Kai (University of Hannover. Institute of Theoretical Physics) ;
Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ;
Yi, X. X. (University of Hannover. Institute of Theoretical Physics) ;
Schliemann, J. (University of Basel. Department of Physics and Astronomy) ;
Bruß, Dagmar (University of Hannover. Institute of Theoretical Physics) ;
Birkl, Gerhard (University of Hannover. Institute of Quantum Optics) ;
Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics) ;
American Physical Society
We investigate quantum computation with neutral atoms in optical microtraps where the qubit is implemented in the motional states of the atoms, i. e. , in the two lowest vibrational states of each trap. [...]
2002 - 10.1103/PhysRevA.66.042317
Physical review. A, Vol. 66, Issue 4 (October 2002) , p. 042317-1-042317-11
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5 p, 435.2 KB |
Three-level atom optics via the tunneling interaction
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Eckert, Kai (University of Hannover. Institute of Theoretical Physics) ;
Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics) ;
Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física) ;
Birkl, Gerhard (University of Hannover. Institute of Quantum Optics) ;
Ertmer, W. (University of Hannover. Institute of Quantum Optics) ;
Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ;
American Physical Society
Three-level atom optics is introduced as a simple, efficient, and robust method to coherently manipulate and transport neutral atoms. The tunneling interaction among three trapped states allows us to realize the spatial analog of the stimulated Raman adiabatic passage, coherent population trapping, and electromagnetically induced transparency techniques and offers a wide range of possible applications. [...]
2004 - 10.1103/PhysRevA.70.023606
Physical review. A, Vol. 70, Issue 2 (August 2004) , p. 023606-1-023606-5
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9 p, 817.9 KB |
One- and two-dimensional quantum walks in arrays of optical traps
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Eckert, Kai (University of Hannover. Institute of Theoretical Physics) ;
Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ;
Birkl, Gerhard (Universität Darmstadt. Institut für Angewandte Physik, Technische) ;
Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics) ;
American Physical Society
We propose a different implementation of discrete-time quantum walks for a neutral atom in an array of optical microtraps or an optical lattice. We analyze a one-dimensional walk in position space, with the coin, the additional qubit degree of freedom that controls the displacement of the quantum walker, implemented as a spatially delocalized qubit, i. [...]
2005 - 10.1103/PhysRevA.72.012327
Physical review. A, Vol. 72, Issue 1 (July 2005) , p. 012327-1-012327-9
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25 p, 976.0 KB |
Disordered ultracold atomic gases in optical lattices : a case study of Fermi-Bose mixtures
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Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ;
Sánchez Palencia, L. (University of Hannover. Institute of Theoretical Physics) ;
Kantian, A. (University of Hannover. Institute of Theoretical Physics) ;
Sanpera Trigueros, Anna (Universitat Autònoma de Barcelona. Departament de Física) ;
Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics) ;
American Physical Society
We present a review of properties of ultracold atomic Fermi-Bose mixtures in inhomogeneous and random optical lattices. In the strong interacting limit and at very low temperatures, fermions form, together with bosons or bosonic holes, composite fermions. [...]
2005 - 10.1103/PhysRevA.72.063616
Physical review. A, Vol. 72, Issue 6 (December 2005) , p. 063616-1-063616-25
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8 p, 236.2 KB |
Quantum-information processing in disordered and complex quantum systems
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Sen, Aditi (Institut de Ciències Fotòniques) ;
Sen, Ujjval (Institut de Ciències Fotòniques) ;
Ahufinger, Verònica (Universitat Autònoma de Barcelona. Departament de Física) ;
Briegel, Hans J. (Österreichische Akademie der Wissenschaften. Institut für Quantenoptik und Quanteninformation) ;
Sanpera Trigueros, Anna (Universitat Autònoma de Barcelona. Departament de Física) ;
Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics) ;
American Physical Society
We study quantum information processing in complex disordered many body systems that can be implemented by using lattices of ultracold atomic gases and trapped ions. We demonstrate, first in the short range case, the generation of entanglement and the local realization of quantum gates in a disordered magnetic model describing a quantum spin glass. [...]
2006 - 10.1103/PhysRevA.74.062309
Physical review. A, Vol. 74, Issue 6 (December 2006) , p. 062309-1-062309-8
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4 p, 200.7 KB |
Quantum computing with spatially delocalized qubits
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Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ;
Eckert, Kai (University of Hannover. Institute of Theoretical Physics) ;
Ertmer, W. (University of Hannover. Institute of Quantum Optics) ;
Birkl, Gerhard (University of Hannover. Institute of Quantum Optics) ;
Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics) ;
American Physical Society
We analyze the operation of quantum gates for neutral atoms with qubits that are delocalized in space, i. e. , the computational basis states are defined by the presence of a neutral atom in the ground state of one out of two trapping potentials. [...]
2003 - 10.1103/PhysRevLett.90.147901
Physical review letters, Vol. 90, Issue 14 (April 2003) , p. 147901
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