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Magnetic field effects (MFE) in certain chemical reactions have been well established in the last five decades and are attributed to the evolution of transient radical-pairs whose spin dynamics are determined by local and external magnetic…

The radical pair mechanism is one of the two main hypotheses to explain the navigability of animals in weak magnetic fields, enabling e.g. birds to see the Earth's magnetic field. It also plays an essential role in the field of spin…

Quantum Physics · Physics 2010-06-08 Jianming Cai , Gian Giacomo Guerreschi , Hans J. Briegel

A quantum-based magnetic compass sensor, mediated through radical pair reactions, has been suggested to underlie the sensory ability of migrating birds to receive directional information from the geomagnetic field. Here we extend the…

Biological Physics · Physics 2013-09-26 Maria Procopio , Thorsten Ritz

The mechanism underlying magnetoreception has long eluded explanation. A popular hypothesis attributes this sense to the quantum coherent spin dynamics of spin-selective recombination reactions of radical pairs in the protein cryptochrome.…

Quantum Physics · Physics 2026-04-17 Luke D. Smith , Farhan T. Chowdhury , Iona Peasgood , Nahnsu Dawkins , Daniel R. Kattnig

The radical pair mechanism is an important model that may provide a basis for biological magnetoreception. To account for the high orientation precision of the real avian compass, P. J. Hore et al. proposed an intriguing phenomenon called…

Biological Physics · Physics 2024-11-12 Xiaoyu Chen , Haibin Liu , Jianming Cai

For the first time in history, humankind might conceivably begin to imagine itself as a multi-planetary species. This goal will entail technical innovation in a number of contexts, including that of healthcare. All life on Earth shares an…

Biological Physics · Physics 2024-11-07 Betony Adams , Abbas Hassasfar , Ilya Sinayskiy , Alistair Nunn , Geoffrey Guy , Francesco Petruccione

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…

Quantum Physics · Physics 2017-04-06 K. M. Vitalis , I. K. Kominis

The radical-pair mechanism was introduced in the 1960's to explain anomalously large EPR and NMR signals in chemical reactions of organic molecules. It has evolved to the cornerstone of spin chemistry, the study of the effect electron and…

Biological Physics · Physics 2016-01-05 I. K. Kominis

Mechanical resonators operating in the high-frequency regime have become a versatile platform for fundamental and applied quantum research. Their exceptional properties, such as low mass and high quality factor, make them also very…

Mesoscale and Nanoscale Physics · Physics 2023-11-29 Diego A. Visani , Letizia Catalini , Christian L. Degen , Alexander Eichler , Javier del Pino

Magnetic measurement can be performed by various sensors, such as SQUID and Giant Magnetoresistance. This device can achieve high accuracy while losing efficiency and convenience. The model of biological magnetic sensing in avian proposes a…

Quantum Physics · Physics 2022-02-25 Wei-Yin Chiang , Yuan-Chung Cheng , Min-Hsiu Hsieh

The Radical Pair Mechanism is a canonical model for the magnetosensitivity of chemical reaction processes. The key ingredient of this model is the hyperfine interaction that induces a coherent mixing of singlet and triplet electron spin…

Chemical Physics · Physics 2018-09-12 Robert H. Keens , Salil Bedkihal , Daniel R. Kattnig

Quantum dynamics of the radical pair mechanism is a major driving force in quantum biology, materials science, and spin chemistry. The rich quantum physical underpinnings of the mechanism are determined by a coherent oscillation (quantum…

Quantum Physics · Physics 2023-06-21 Meltem Tolunay , Ieva Liepuoniute , Mariya Vyushkova , Barbara A. Jones

The applications of spin-based quantum sensors to measurements probing fundamental physics are surveyed. Experimental methods and technologies developed for quantum information science have rapidly advanced in recent years, and these tools…

Magnetosensitive spin-correlated radical-pairs (SCRPs) offer a promising platform for noise-robust quantum metrology. However, unavoidable interradical interactions, such as electron-electron dipolar and exchange couplings, alongside…

Quantum Physics · Physics 2026-02-25 Luke D. Smith , Farhan T. Chowdhury , Jonas Glatthard , Daniel R. Kattnig

A large and growing body of research shows that weak magnetic fields can significantly influence various biological systems, including plants, animals, and humans. However, the underlying mechanisms behind these phenomena remain elusive. It…

Biological Physics · Physics 2022-04-21 Hadi Zadeh-Haghighi , Christoph Simon

Radical pair recombination reactions are known to be sensitive to extremely weak magnetic fields, and can therefore be said to function as molecular magnetoreceptors. The classic example is a carotenoid-porphyrin-fullerene (C+PF-) radical…

Chemical Physics · Physics 2020-04-24 Lachlan P. Lindoy , Thomas P. Fay , David E. Manolopoulos

Radical-ion-pair reactions were recently shown to represent a rich biophysical laboratory for the application of quantum measurement theory methods and concepts, casting doubt on the validity of the theoretical treatment of these reactions…

Quantum Physics · Physics 2010-09-16 I. K. Kominis

We review the spin radical pair mechanism which is a promising explanation of avian navigation. This mechanism is based on the dependence of product yields on (1) the hyperfine interaction involving electron spins and neighboring nuclear…

Biological Physics · Physics 2015-03-24 Yiteng Zhang , Gennady P. Berman , Sabre Kais

Since the 1970s, spin-selective reactions of radical pairs have been modelled theoretically by adding phenomenological rate equations to the quantum mechanical equation of motion of the radical pair spin density matrix. Here, using a…

Quantum Physics · Physics 2010-03-04 Jonathan A. Jones , Peter J. Hore

One possible explanation for magnetosensing in biology, such as avian magnetoreception, is based on the spin dynamics of certain chemical reactions that involve radical pairs. Radical pairs have been suggested to also play a role in…

Biological Physics · Physics 2023-01-23 Hadi Zadeh-Haghighi , Christoph Simon
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