TY - JOUR
T1 - Unsupervised Classification of Quantum Data
JF - Physical Review X
Y1 - 2019
A1 - Sentís, Gael
A1 - Monras, Alex
A1 - Muñoz-Tapia, Ramon
A1 - John Calsamiglia
A1 - Bagan, Emilio
VL - 9
UR - https://link.aps.org/doi/10.1103/PhysRevX.9.041029http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevX.9.041029/fulltexthttps://link.aps.org/article/10.1103/PhysRevX.9.041029
JO - Phys. Rev. X
ER -
TY - JOUR
T1 - Operational Interpretation for Global Multipartite Entanglement
JF - Physical Review Letters
Y1 - 2008
A1 - Boixo, Sergio
A1 - Monras, Alex
KW - multipartite entanglement
VL - 100
UR - http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PRLTAO000100000010100503000001&idtype=cvips&prog=normal http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000100000010100503000001&idtype=cvips&gifs=yes http://
ER -
TY - JOUR
T1 - Phase variance of squeezed vacuum states
JF - Physical Review A (Atomic, Molecular, and Optical Physics)
Y1 - 2008
A1 - Bagan, Emili
A1 - Monras, Alex
A1 - Muñoz-Tapia, Ramon
KW - optical squeezing
VL - 78
UR - http://link.aps.org/abstract/PRA/v78/e043829
ER -
TY - JOUR
T1 - Quantum information processing in spin chains via quantum Zeno dynamics
JF - arXiv
Y1 - 2008
A1 - Monras, Alex
A1 - Romero-Isart, Oriol
KW - spin chain
AB - We show how the quantum Zeno effect can be exploited to control quantum information in a spin chain in a flexible way. In particular, we consider a one dimensional array of three level systems interacting via a swap operator, an interaction found in a generalized Heisenberg Hamiltonian. By encoding the qubit into two levels and using simple projective frequent measurements, the dynamics of the chain is guided to achieve basic quantum information manipulation tools, $\backslash$emph\{i.e.\}, quantum registers, single qubit operations and quantum state transfer on demand, while local addressability is not required. State transfer is perfect, robust against errors and delivers qubits at a constant rate, unconditional of the length of the transfer. Moreover, two dimensional lattices with tunable global interactions in different directions offer the possibility of performing two-qubit gates.
UR - http://arxiv.org/abs/0801.1959
ER -
TY - JOUR
T1 - Optimal Quantum Estimation of Loss in Bosonic Channels
JF - Physical Review Letters
Y1 - 2007
A1 - Monras, Alex
A1 - Paris, Matteo G. A.
VL - 98
UR - http://link.aps.org/abstract/PRL/v98/e160401
ER -
TY - JOUR
T1 - Optimal full estimation of qubit mixed states
JF - Physical Review A (Atomic, Molecular, and Optical Physics)
Y1 - 2006
A1 - Bagan, Emili
A1 - Ballester, M. A.
A1 - Gill, R. D.
A1 - Monras, Alex
A1 - Muñoz-Tapia, Ramon
KW - mixed states
KW - probability
KW - state estimation
VL - 73
UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLRAAN000073000003032301000001&idtype=cvips&gifs=yes
ER -
TY - JOUR
T1 - Optimal phase measurements with pure Gaussian states
JF - Physical Review A (Atomic, Molecular, and Optical Physics)
Y1 - 2006
A1 - Monras, Alex
KW - gaussian states
KW - optical squeezing
KW - optical tomography
KW - quantum theory
VL - 73
UR - http://scitation.aip.org/vsearch/servlet/VerityServlet?KEY=ALL&possible1=Monras%2C+Alex&possible1zone=author&maxdisp=25&smode=strresults&aqs=true
ER -
TY - JOUR
T1 - Comprehensive analysis of quantum pure-state estimation for two-level systems
JF - Physical Review A (Atomic, Molecular, and Optical Physics)
Y1 - 2005
A1 - Bagan, Emili
A1 - Monras, Alex
A1 - Muñoz-Tapia, Ramon
AB - Given N identical copies of the state of a quantum two-level system, we analyze its optimal estimation. We consider two situations: general pure states and (pure) states restricted to lie on the equator of the Bloch sphere. We perform a complete and comprehensive analysis of the optimal schemes based on local measurements, and give results (optimal measurements, maximum fidelity, etc.) for arbitrary N, not necessarily large, within the Bayesian framework. We also make a comparative analysis of the asymptotic limit of these results with those derived from a (pointwise) Cramér-Rao type of approach. We give explicit schemes based on local measurements and no classical communication that saturate the fidelity bounds of the most general collective schemes.
PB - American Physical Society
VL - 71
UR - http://link.aps.org/doi/10.1103/PhysRevA.71.062318
ER -
TY - CONF
T1 - Optimal reconstruction of a pure qubit state with local measurements
T2 - Proceedings of the 8th ICSSUR
Y1 - 2003
A1 - Bagan, Emili
A1 - Baig, Marià
A1 - Monras, Alex
A1 - Muñoz-Tapia, Ramon
JF - Proceedings of the 8th ICSSUR
PB - Rinton Press (2003)
ER -