TY - JOUR
T1 - Reinforcement learning for optimal error correction of toric codes
JF - Physics Letters A
Y1 - 2020
A1 - Domingo Colomer, Laia
A1 - Skotiniotis, Michalis
A1 - Muñoz-Tapia, Ramon
VL - 384
UR - https://linkinghub.elsevier.com/retrieve/pii/S0375960120301638
JO - Physics Letters A
ER -
TY - JOUR
T1 - Recycling of qubits
JF - Physica Scripta
Y1 - 2010
A1 - P Rapcan
A1 - John Calsamiglia
A1 - Muñoz-Tapia, Ramon
A1 - Bagan, Emilio
A1 - V Buzek
AB - We consider a finite number, N, of qubits that encode a pure single qubit state SU(2) covariantly. Given the N-qubit state has already been measured optimally to estimate the single-qubit state, we analyse the maximum information obtainable by a second, and subsequent observers ignorant of important details of the previous measurements. We quantify the information acquired by each observer as a function of N and of the number of independent observers that in succession have independently measured the same ensemble of qubits before him.
VL - T140
UR - http://iopscience.iop.org/1402-4896/2010/T140/014059?fromSearchPage=true
ER -
TY - JOUR
T1 - Recycling of quantum information: Multiple observations of quantum systems
JF - arXiv
Y1 - 2007
A1 - Rapcan, Peter
A1 - John Calsamiglia
A1 - Muñoz-Tapia, Ramon
A1 - Bagan, Emili
A1 - Bużek, Vladimir
AB - Given a finite number of copies of an unknown qubit state that have already been measured optimally, can one still extract any information about the original unknown state? We give a positive answer to this question and quantify the information obtainable by a given observer as a function of the number of copies in the ensemble, and of the number of independent observers that, one after the other, have independently measured the same ensemble of qubits before him. The optimality of the protocol is proven and extensions to other states and encodings are also studied. According to the general lore, the state after a measurement has no information about the state before the measurement. Our results manifestly show that this statement has to be taken with a grain of salt, specially in situations where the quantum states encode confidential information.
UR - http://arxiv.org/abs/0708.1086
ER -
TY - JOUR
T1 - Relative states, quantum axes, and quantum references
JF - Physical Review A (Atomic, Molecular, and Optical Physics)
Y1 - 2006
A1 - Bagan, Emili
A1 - Iblisdir, Sofyan
A1 - Muñoz-Tapia, Ramon
KW - quantum theory
VL - 73
UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLRAAN000073000002022341000001&idtype=cvips&gifs=yes
ER -