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15 papers · 2 filters
Noisy metrology beyond the standard quantum limit
R. Chaves, J. B. Brask, M. Markiewicz +2
Parameter estimation is of fundamental importance in areas from atomic spectroscopy and atomic clocks to gravitational wave detection. Entangled probes provide a significant precis…
Parameter estimation in a memory-assisted noisy quantum interferometry
P. Szankowski, M. Trippenbach, J. Chwedenczuk
We demonstrate that memory in an -qubit system subjected to decoherence, is a potential resource for the slow-down of the entanglement decay. We show that this effect can be use…
Nonsymmetrized Correlations in Quantum Noninvasive Measurements
Adam Bednorz, Christoph Bruder, Bertrand Reulet +1
A long-standing problem in quantum mesoscopic physics is which operator order corresponds to noise expressions like <I(-ω)I(ω)>, where I(ω) is the measured current at frequency ω.…
Quantum key distribution with realistic heralded single photon sources
Mikolaj Lasota, Rafal Demkowicz-Dobrzanski, Konrad Banaszek
We analyze theoretically performance of four-state quantum key distribution protocols implemented with a realistic heralded single-photon source. The analysis assumes a noisy model…
A Multi-path Interferometer with Ultracold Atoms Trapped in an Optical Lattice
J. Chwedenczuk, F. Piazza, A. Smerzi
We study an ultra-cold gas of bosons trapped in a one dimensional -site optical lattice perturbed by a spatially dependent potential , where the unknown coupling…
Analytical two-center integrals over Slater geminal functions
Michał Lesiuk, Robert Moszynski
We present analytical formulas for the calculation of the two-center two-electron integrals in the basis of Slater geminals and products of Slater orbitals. Our derivation starts w…