TY - JOUR
T1 - Probabilistically Perfect Cloning of Two Pure States: Geometric Approach
JF - Physical Review Letters
Y1 - 2016
A1 - Yerokhin, V.
A1 - Shehu, A.
A1 - Feldman, E.
A1 - E. Bagan
A1 - Bergou, J. A.
VL - 116
IS - 20
JO - Phys. Rev. Lett.
ER -
TY - JOUR
T1 - Relations between Coherence and Path Information
JF - Phys. Rev. Lett.
Y1 - 2016
A1 - E. Bagan
A1 - Bergou, János A.
A1 - Cottrell, Seth S.
A1 - Hillery, Mark
PB - American Physical Society
VL - 116
UR - http://link.aps.org/doi/10.1103/PhysRevLett.116.160406
ER -
TY - JOUR
T1 - A geometric approach to quantum state separation
JF - New Journal of Physics
Y1 - 2015
A1 - E. Bagan
A1 - Yerokhin, V.
A1 - Shehu, A.
A1 - Feldman, E.
A1 - Bergou, J. A.
AB - Probabilistic quantum state transformations can be characterized by the degree of state separation they provide. This, in turn, sets limits on the success rate of these transformations. We consider optimum state separation of two known pure states in the general case where the known states have arbitrary a priori probabilities. The problem is formulated from a geometric perspective and shown to be equivalent to the problem of finding tangent curves within two families of conics that represent the unitarity constraints and the objective functions to be optimized, respectively. We present the corresponding analytical solutions in various forms. In the limit of perfect state separation, which is equivalent to unambiguous state discrimination, the solution exhibits a phenomenon analogous to a second order symmetry breaking phase transition. We also propose a linear optics implementation of separation which is based on the dual rail representation of qubits and single-photon multiport interferometry.
VL - 17
UR - http://stacks.iop.org/1367-2630/17/i=12/a=123015
ER -
TY - JOUR
T1 - Probabilistic Metrology Attains Macroscopic Cloning of Quantum Clocks
JF - Physical Review Letters
Y1 - 2014
A1 - Gendra, B.
A1 - John Calsamiglia
A1 - Muñoz-Tapia, R.
A1 - E. Bagan
A1 - Chiribella, G.
VL - 113
UR - http://link.aps.org/doi/10.1103/PhysRevLett.113.260402
ER -
TY - JOUR
T1 - Programmable discrimination with an error margin
JF - Physical Review A
Y1 - 2013
A1 - Sentís, G
A1 - E. Bagan
A1 - John Calsamiglia
A1 - Muñoz-Tapia, R.
VL - 88
IS - 5
JO - Phys. Rev. A
ER -
TY - JOUR
T1 - Quantum Metrology Assisted by Abstention
JF - Physical Review Letters
Y1 - 2013
A1 - Gendra, B.
A1 - Ronco-Bonvehi, E.
A1 - John Calsamiglia
A1 - Muñoz-Tapia, R.
A1 - E. Bagan
AB - 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. We focus on phase estimation and quantify the required amount of abstention for a given precision. We also develop analytical tools to obtain the asymptotic behavior of the precision and required rate of abstention for arbitrary pure states.
VL - 110
UR - http://prl.aps.org/abstract/PRL/v110/i10/e100501
IS - 10
JO - Phys. Rev. Lett.
ER -
TY - JOUR
T1 - Local Discrimination of Mixed States
JF - Phys. Rev. Lett.
Y1 - 2010
A1 - John Calsamiglia
A1 - de Vicente, J. I.
A1 - Muñoz-Tapia, R.
A1 - E. Bagan
PB - American Physical Society
VL - 105
ER -
TY - JOUR
T1 - Discriminating States: The Quantum Chernoff Bound
JF - Physical Review Letters
Y1 - 2007
A1 - K. M. R. Audenaert
A1 - John Calsamiglia
A1 - R. {Munoz-Tapia}
A1 - E. Bagan
A1 - Ll. Masanes
A1 - A. Acin
A1 - F. Verstraete
VL - 98
UR - http://link.aps.org/abstract/PRL/v98/e160501
ER -
TY - JOUR
T1 - Minimal measurements of the gate fidelity of a qudit map
JF - Physical Review A
Y1 - 2003
A1 - E. Bagan
A1 - Baig, M.
A1 - Muñoz-Tapia, R.
VL - 67
UR - http://pra.aps.org/abstract/PRA/v67/i1/e014303
ER -
TY - JOUR
T1 - Optimal Scheme for Estimating a Pure Qubit State via Local Measurements
JF - Physical Review Letters
Y1 - 2002
A1 - E. Bagan
A1 - Baig, M.
A1 - Muñoz-Tapia, R.
VL - 89
UR - http://prl.aps.org/abstract/PRL/v89/i27/e277904
ER -
TY - JOUR
T1 - Aligning Reference Frames with Quantum States
JF - Physical Review Letters
Y1 - 2001
A1 - E. Bagan
A1 - Baig, M.
A1 - Muñoz-Tapia, R.
VL - 87
UR - http://prl.aps.org/abstract/PRL/v87/i25/e257903
ER -
TY - JOUR
T1 - Communication of spin directions with product states and finite measurements
JF - Physical Review A
Y1 - 2001
A1 - E. Bagan
A1 - Baig, M.
A1 - Muñoz-Tapia, R.
VL - 64
UR - http://pra.aps.org/abstract/PRA/v64/i2/e022305
ER -
TY - JOUR
T1 - Optimal encoding and decoding of a spin direction
JF - Physical Review A
Y1 - 2001
A1 - E. Bagan
A1 - Baig, M.
A1 - Brey, A.
A1 - Muñoz-Tapia, R.
A1 - Tarrach, R.
VL - 63
UR - http://pra.aps.org/abstract/PRA/v63/i5/e052309
ER -