Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for subject:(Biochemical magnetometers). One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters

1. Vitalis, Kyriacos. Quantum metrology in biochemical magnetometers.

Degree: 2017, University of Crete (UOC); Πανεπιστήμιο Κρήτης

Radical-ion pairs and their reactions have triggered the study of quantum effects in biological systems. This is because they exhibit a number of effects best understood within quantum information science, and at the same time are central in understanding the avian magnetic compass and the spin transport dynamics in photosynthetic reaction centers. These pairs of biomolecular ions are recently shown to be biological open quantum systems. We show that the coupling of the radical-pair spin degrees of freedom to its decohering vibrational reservoir leads to a phononic Lamb shift of the radical-pair magnetic energy levels. The Lamb shift Hamiltonian is diagonal in the singlet-triplet basis, and results in a singlet-triplet energy splitting physically indistinguishable from an exchange interaction. This could have significant implications for understanding the energy level structure and the dynamics of photosynthetic reaction centers, which are intimately connected with the remarkable efficiency of photosynthesis [Eur. Phys. J. Plus 129, 187 (2014)]. Moreover, we address radical-pair reactions from the perspective of quantum metrology and parameter estimation. Since the coherent spin-motion of radical pairs is effected by an external magnetic field, these spin-dependent reactions essentially realize a biochemical magnetometer. Using the quantum Fisher information, we find the fundamental quantum limits to the magnetic sensitivity of radical-pair magnetometers. We then explore how well the usual measurement scheme considered in radical-pair reactions, the measurement of reaction yields, approaches the fundamental limits. In doing so, we find the optimal hyperfine interaction Hamiltonian that leads to the best magnetic sensitivity as obtained from reaction yields. This is still an order of magnitude smaller than the absolute quantum limit. Finally, we demonstrate that with a realistic quantum reaction control reminding one of Ramsey interferometry, here presented as a quantum circuit involving the spin-exchange interaction and a recently proposed molecular switch, we can approach the fundamental quantum limit within a factor of 2. Hence, this work opens the application of well-advanced quantum metrology methods to biological systems [Phys. Rev. A 95, 032129 (2017)].

Τα Ζεύγη Ιοντικών Ριζών (Radical-Ion Pairs) και οι βιοχημικές τους αντιδράσεις αποτελούν έναυσμα για τη μελέτη κβαντικών φαινομένων στα βιολογικά συστήματα. Αυτό οφείλεται στο ότι παρουσιάζουν μια σειρά φαινομένων που ανήκουν, και μπορούν να γίνουν κατανοητά, στο πεδίο της επιστήμης της κβαντικής πληροφορίας και ταυτόχρονα είναι κεντρικής σημασίας για την κατανόηση του μηχανισμού της βιοχημικής πυξίδας των αποδημητικών πτηνών, καθώς και της δυναμικής της μεταφοράς του σπιν στα ενεργά κέντρα της φωτοσύνθεσης (photosynthetic reaction centers). Πρόσφατα, έχει δειχθεί ότι οι βαθμοί ελευθερίας του σπιν αυτών των βιοχημικών συστημάτων αποτελούν ανοικτά κβαντικά συστήματα. Στην παρούσα διατριβή, δείχνουμε ότι η σύζευξη του σπιν του Ζεύγους Ιοντικών Ριζών με τις…

Subjects/Keywords: Κβαντική μετρολογία; Μηχανισμός ζεύγους ιοντικών ριζών; Βιοχημικά μαγνητόμετρα; Κβαντική εκτίμηση παραμέτρου; Κβαντική πληροφορία Fisher; Μετατόπιση Lamb; Ενεργά κέντρα της φωτοσύνθεσης; Κβαντική βιολογία; Quantum metrology; Radical-pair mechanism; Biochemical magnetometers; Quantum parameter estimation; Quantum Fisher information; Lamb shift; Photosynthetic reaction centers; Quantum biology

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Vitalis, K. (2017). Quantum metrology in biochemical magnetometers. (Thesis). University of Crete (UOC); Πανεπιστήμιο Κρήτης. Retrieved from http://hdl.handle.net/10442/hedi/40576

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Vitalis, Kyriacos. “Quantum metrology in biochemical magnetometers.” 2017. Thesis, University of Crete (UOC); Πανεπιστήμιο Κρήτης. Accessed September 19, 2020. http://hdl.handle.net/10442/hedi/40576.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Vitalis, Kyriacos. “Quantum metrology in biochemical magnetometers.” 2017. Web. 19 Sep 2020.

Vancouver:

Vitalis K. Quantum metrology in biochemical magnetometers. [Internet] [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2017. [cited 2020 Sep 19]. Available from: http://hdl.handle.net/10442/hedi/40576.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Vitalis K. Quantum metrology in biochemical magnetometers. [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2017. Available from: http://hdl.handle.net/10442/hedi/40576

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.