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Artículos Encontrados 18 registros  anterior11 - 18  ir al registro: La búsqueda tardó 0.01 segundos. 
11.
16 p, 310.2 KB Scavenging quantum information : multiple observations of quantum systems / Rapčan, Peter (Slovak Academy of Sciences. Institute of Physics) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Bužek, Vladimir (Slovak Academy of Sciences. Institute of Physics) ; American Physical Society
Given an unknown state of a qudit that has already been measured optimally, can one still extract any information about the original unknown state? Clearly, after a maximally informative measurement, the state of the system collapses into a postmeasurement state from which the same observer cannot obtain further information about the original state of the system. [...]
2011 - 10.1103/PhysRevA.84.032326
Physical review. A, Vol. 84, Issue 3 (September 2011) , p. 032326-1-032326-16  
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12.
7 p, 200.6 KB Programmable discrimination with an error margin / Sentís Herrera, Gael (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
The problem of optimally discriminating between two completely unknown qubit states is generalized by allowing an error margin. It is visualized as a device-the programmable discriminator-with one data and two program ports, each fed with a number of identically prepared qubits-the data and the programs. [...]
2013 - 10.1103/PhysRevA.88.052304
Physical review. A, Vol. 88, Issue 5 (November 2013) , p. 052304-1-052304-7  
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13.
15 p, 382.3 KB Optimal parameter estimation with a fixed rate of abstention / Gendra Casalí, Bernat (Universitat Autònoma de Barcelona. Departament de Física) ; Ronco Bonvehi, Elio (Universitat Autònoma de Barcelona. Departament de Física) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
The problems of optimally estimating a phase, a direction, and the orientation of a Cartesian frame (or trihedron) with general pure states are addressed. Special emphasis is put on estimation schemes that allow for inconclusive answers or abstention. [...]
2013 - 10.1103/PhysRevA.88.012128
Physical review. A, Vol. 88, Issue 1 (July 2013) , p. 012128-1-012128-15  
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14.
5 p, 155.3 KB Quantum metrology assisted by abstention / Gendra Casalí, Bernat (Universitat Autònoma de Barcelona. Departament de Física) ; Ronco Bonvehi, Elio (Universitat Autònoma de Barcelona. Departament de Física) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
The main goal of quantum metrology is to obtain accurate values of physical parameters using quantum probes. In this context, we show that abstention, i. e. , the possibility of getting an inconclusive answer at readout, can drastically improve the measurement precision and even lead to a change in its asymptotic behavior, from the shot-noise to the Heisenberg scaling. [...]
2013 - 10.1103/PhysRevLett.110.100501
Physical review letters, Vol. 110, Issue 10 (March 2013) , p. 100501-1-100501-5  
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15.
4 p, 100.6 KB Discriminating states : the quantum Chernoff bound / Audenaert, K. M. R. (Imperial College London. Institute for Mathematical Sciences) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Masanes, Ll. (University of Cambridge. Department of Applied Mathematics and Theoretical Physics) ; Acín, Antonio (Institut de Ciències Fotòniques) ; Verstraete, F. (Universität Wien. Fakultät für Physik) ; American Physical Society
We consider the problem of discriminating two different quantum states in the setting of asymptotically many copies, and determine the minimal probability of error. This leads to the identification of the quantum Chernoff bound, thereby solving a long-standing open problem. [...]
2007 - 10.1103/PhysRevLett.98.160501
Physical review letters, Vol. 98, Issue 16 (April 2007) , p. 160501  
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16.
4 p, 190.3 KB Entanglement percolation in quantum complex networks / Cuquet Palau, Martí (Universitat Autònoma de Barcelona. Departament de Física) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
Quantum networks are essential to quantum information distributed applications, and communicating over them is a key challenge. Complex networks have rich and intriguing properties, which are as yet unexplored in the quantum setting. [...]
2009 - 10.1103/PhysRevLett.103.240503
Physical review letters, Vol. 103, Issue 24 (December 2009) , p. 240503  
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17.
4 p, 160.1 KB Local discrimination of mixed states / Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; de Vicente Majúa, Julio Íñigo (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We provide rigorous, efficiently computable and tight bounds on the average error probability of multiple-copy discrimination between qubit mixed states by local operations assisted with classical communication (LOCC). [...]
2010 - 10.1103/PhysRevLett.105.080504
Physical review letters, Vol. 105, Issue 8 (August 2010) , p. 80504  
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18.
8 p, 354.7 KB Quantum learning without quantum memory / Sentís Herrera, Gael (Universitat Autònoma de Barcelona. Departament de Física) ; Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física)
A quantum learning machine for binary classification of qubit states that does not require quantum memory is introduced and shown to perform with the minimum error rate allowed by quantum mechanics for any size of the training set. [...]
2012 - 10.1038/srep00708
Scientific reports, Vol. 2, art. 708 (October 2012)  
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