Zobrazeno 1 - 10
of 506
pro vyhledávání: '"R H, SMITH"'
Publikováno v:
Quantum, Vol 8, p 1338 (2024)
According to relativity, the reading of an ideal clock is interpreted as the elapsed proper time along its classical trajectory through spacetime. In contrast, quantum theory allows the association of many simultaneous trajectories with a single quan
Externí odkaz:
https://doaj.org/article/d2eb82263a0c49ec8a51989cc53b44c1
Autor:
Alexander R. H. Smith, Mehdi Ahmadi
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-9 (2020)
The usual definition of external time is unlikely to survive if we want to unite quantum mechanics and relativity. Here the authors consider two quantum clocks moving in curved spacetime and formulate the probability distribution that relates their p
Externí odkaz:
https://doaj.org/article/c6a7e6cf859044e1bb203c0450502c37
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 5, Pp 1-38 (2019)
Abstract We examine in (2+1)-dimensional anti-de Sitter (AdS) space the phenomena of entanglement harvesting — the process in which a pair of detectors (two-level atoms) extract entanglement from a quantum field through local interactions with the
Externí odkaz:
https://doaj.org/article/e50684cc4f444cf7abab865d6e488fb7
Publikováno v:
Frontiers in Physics, Vol 9 (2021)
We have previously shown that three approaches to relational quantum dynamics—relational Dirac observables, the Page-Wootters formalism and quantum deparametrizations—are equivalent. Here we show that this “trinity” of relational quantum dyna
Externí odkaz:
https://doaj.org/article/5159d8f852c04071920214ca07811793
Autor:
Veronika Baumann, Flavio Del Santo, Alexander R. H. Smith, Flaminia Giacomini, Esteban Castro-Ruiz, Caslav Brukner
Publikováno v:
Quantum, Vol 5, p 524 (2021)
The quantum measurement problem can be regarded as the tension between the two alternative dynamics prescribed by quantum mechanics: the unitary evolution of the wave function and the state-update rule (or "collapse") at the instant a measurement tak
Externí odkaz:
https://doaj.org/article/1a7f1603e2a748dba388bcb039611ba7
Publikováno v:
Physical Review Research, Vol 3, Iss 2, p 023053 (2021)
Quantum time dilation occurs when a clock moves in a superposition of relativistic momentum wave packets. The lifetime of an excited hydrogenlike atom can be used as a clock, which we use to demonstrate how quantum time dilation manifests in a sponta
Externí odkaz:
https://doaj.org/article/6d1dfd45591e43629936ef18fea2cb30
Autor:
C. D. Porter, J. R. H. Smith, E. M. Stagar, A. Simmons, M. Nieberding, C. M. Orban, J. Brown, A. Ayers
Publikováno v:
Physical Review Physics Education Research, Vol 16, Iss 2, p 020119 (2020)
Recent years have seen a resurgence of interest in using virtual reality (VR) technology to benefit instruction, especially in physics and related subjects. As VR devices improve and become more widely available, there remains a number of unanswered
Externí odkaz:
https://doaj.org/article/d7b9eb8687bc4c7a9feae66e026572a6
Autor:
Alexander R. H. Smith, Mehdi Ahmadi
Publikováno v:
Quantum, Vol 3, p 160 (2019)
This article generalizes the conditional probability interpretation of time in which time evolution is realized through entanglement between a clock and a system of interest. This formalism is based upon conditioning a solution to the Wheeler-DeWitt
Externí odkaz:
https://doaj.org/article/eb9b8adc4dfa453b8adb570a26dbf0fd
Autor:
Nicholas L. Abbott, JungHyun Noh, Chul Soon Park, Victor M. Zavala, Shengli Jiang, Alexander R. H. Smith
Publikováno v:
The Analyst. 146:1224-1233
Detection and quantification of bacterial endotoxins is important in a range of health-related contexts, including during pharmaceutical manufacturing of therapeutic proteins and vaccines. Here we combine experimental measurements based on nematic li
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8061fd2d66c24d7d66e6ec626f7c4348
https://doi.org/10.1039/d0an02220a
https://doi.org/10.1039/d0an02220a
Autor:
Shadi Ali Ahmad, Alexander R. H. Smith
Publikováno v:
Physical Review A. 105
Work is an observable quantity associated with a process, however there is no Hermitian operator associated with its measurement. We consider an ancilla-assisted protocol measuring the work done on a quantum system driven by a time-dependent Hamilton
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::23fe5142af1b72c06c6db9fc48321a7c
https://doi.org/10.1103/physreva.105.052411
https://doi.org/10.1103/physreva.105.052411