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14 papers · 2 filters
Bayesian quantum frequency estimation in presence of collective dephasing
Katarzyna Macieszczak, Martin Fraas, Rafal Demkowicz-Dobrzanski
We advocate a Bayesian approach to optimal quantum frequency estimation - an important issue for future quantum enhanced atomic clock operation. The approach provides a clear insig…
Cauchy-Schwarz inequality and particle entanglement
T. Wasak, P. Szankowski, P. Zin +2
The Glauber-Sudarshan -representation is used in quantum optics to distinguish between semi-classical and genuinely quantum electromagnetic fields. We employ the analog of the $…
Quantum mechanical which-way experiment with an internal degree of freedom
Konrad Banaszek, Pawel Horodecki, Michal Karpinski +1
For a particle travelling through an interferometer, the trade-off between the available which-way information and the interference visibility provides a lucid manifestation of the…
Optimal measurements in phase estimation: simple examples
T. Wasak, J. Chwedenczuk, L. Pezze +1
We identify optimal measurement strategies for phase estimation in different scenarios. For pure states of a single qubit, we show that optimal measurements form a broad set parame…
Precision bounds for noisy nonlinear quantum metrology
Marcin Zwierz, Howard M. Wiseman
We derive the ultimate bounds on the performance of nonlinear measurement schemes in the presence of noise. In particular, we investigate the precision of the second-order estimati…
Testing locality and noncontextuality with the lowest moments
Adam Bednorz, Witold Bednorz, Wolfgang Belzig
The quest for fundamental test of quantum mechanics is an ongoing effort. We here address the question of what are the lowest possible moments needed to prove quantum nonlocality a…