TY - JOUR
T1 - Quantum metrology assisted by abstention
AU - Gendra, B.
AU - Ronco-Bonvehi, E.
AU - Calsamiglia, J.
AU - Muñoz-Tapia, R.
AU - Bagan, E.
PY - 2013/3/4
Y1 - 2013/3/4
N2 - 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. © 2013 American Physical Society.
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. © 2013 American Physical Society.
UR - https://ddd.uab.cat/record/115510
U2 - https://doi.org/10.1103/PhysRevLett.110.100501
DO - https://doi.org/10.1103/PhysRevLett.110.100501
M3 - Article
VL - 110
M1 - 100501
ER -