Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Karol Gietka"'
Autor:
Karol Gietka
Publikováno v:
Physical Review Research, Vol 4, Iss 4, p 043074 (2022)
In quantum metrology, one typically creates correlations among atoms or photons to enhance measurement precision. Here, we show how one can use other excitations to perform quantum-enhanced measurements on the example of center-of-mass excitations of
Externí odkaz:
https://doaj.org/article/1ca5a92376c849c7b36bf3248b31b61d
Publikováno v:
Quantum, Vol 6, p 700 (2022)
We carefully examine critical metrology and present an improved critical quantum metrology protocol which relies on quenching a system exhibiting a superradiant quantum phase transition beyond its critical point. We show that this approach can lead t
Externí odkaz:
https://doaj.org/article/771c1860364347a7a0d4072007ad2439
Publikováno v:
Quantum, Vol 5, p 489 (2021)
We show that the quantum Fisher information attained in an adiabatic approach to critical quantum metrology cannot lead to the Heisenberg limit of precision and therefore $regular$ quantum metrology under optimal settings is always superior. Furtherm
Externí odkaz:
https://doaj.org/article/1c7a377775474f69b2d663aa05943af4
Publikováno v:
New Journal of Physics, Vol 23, Iss 4, p 043020 (2021)
We propose a novel type of composite light–matter magnetometer based on a transversely driven multi-component Bose–Einstein condensate coupled to two distinct electromagnetic modes of a linear cavity. Above the critical pump strength, the change
Externí odkaz:
https://doaj.org/article/f4c0f724553743659c84873b79c30462
Autor:
Helmut Ritsch, Karol Gietka
We predict that exploiting spin-orbit coupling in a harmonically trapped spinor quantum gas can lead to scaling of the optimal measurement precision beyond the Heisenberg scaling. We show that quadratic scaling with the number of atoms can be facilit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e5c265c8e43d66cf23e1a0dfa8288a83
http://arxiv.org/abs/2211.10436
http://arxiv.org/abs/2211.10436
In distributed quantum sensing the correlations between multiple modes, typically of a photonic system, are utilized to enhance the measurement precision of an unknown parameter. In this work we investigate the metrological potential of a multi-mode,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1722825589844f9ef7bda83ca58edab2
Autor:
Karol Gietka
We present an alternative protocol allowing for the preparation of critical states that instead of suffering from the critical slowing-down benefits from the critical speeding-up. Paradoxically, we prepare these states by going away from the critical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe7f7be62de2792db796dd517be976a3
http://arxiv.org/abs/2111.12206
http://arxiv.org/abs/2111.12206
Autor:
Thomas Busch, Karol Gietka
Publikováno v:
Physical review. E. 104(3-1)
We show how the dynamics of the Dicke model after a quench from the ground-state configuration of the normal phase into the superradiant phase can be described for a limited time by a simple inverted harmonic oscillator model and that this limited ti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ec05630a337f7890f3855387d4a3b3b
https://pubmed.ncbi.nlm.nih.gov/34654177
https://pubmed.ncbi.nlm.nih.gov/34654177
Publikováno v:
Physical review letters. 126(16)
We develop a framework and give an example for situations where two distinct Hamiltonians living in the same Hilbert space can be used to simulate the same physics. As an example of an analog simulation, we first discuss how one can simulate an infin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b9f0a1cf4d46b2f03402895b442091a7
https://pubmed.ncbi.nlm.nih.gov/33961471
https://pubmed.ncbi.nlm.nih.gov/33961471
Publikováno v:
Quantum, Vol 5, p 489 (2021)
We show that the quantum Fisher information attained in an adiabatic approach to critical quantum metrology cannot lead to the Heisenberg limit of precision and therefore regular quantum metrology under optimal settings is always superior. Furthermor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::218c7579176ea419e780a03428d354c4
https://doi.org/10.22331/q-2021-07-01-489
https://doi.org/10.22331/q-2021-07-01-489