Quantum relative entropy shows singlet-triplet coherence is a resource
in the radical-pair mechanism of biological magnetic sensing
- URL: http://arxiv.org/abs/2001.09319v2
- Date: Thu, 7 May 2020 18:04:58 GMT
- Title: Quantum relative entropy shows singlet-triplet coherence is a resource
in the radical-pair mechanism of biological magnetic sensing
- Authors: I. K. Kominis
- Abstract summary: Radical-pair reactions pertinent to biological magnetic field sensing are an ideal system for demonstrating the paradigm of quantum biology.
We introduce and explore a formal measure quantifying singlet-triplet coherence of radical-pairs using the concept of quantum relative entropy.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Radical-pair reactions pertinent to biological magnetic field sensing are an
ideal system for demonstrating the paradigm of quantum biology, the exploration
of quantum coherene effects in complex biological systems. We here provide yet
another fundamental connection between this biochemical spin system and quantum
information science. We introduce and explore a formal measure quantifying
singlet-triplet coherence of radical-pairs using the concept of quantum
relative entropy. The ability to quantify singlet-triplet coherence opens up a
number of possibilities in the study of magnetic sensing with radical-pairs. We
first use the explicit quantification of singlet-triplet coherence to
affirmatively address the major premise of quantum biology, namely that quantum
coherence provides an operational advantage to magnetoreception. Secondly, we
use the concept of incoherent operations to show that incoherent manipulations
of nuclear spins can have a dire effect on singlet-triplet coherence when the
radical-pair exhibits electronic-nuclear entanglement. Finally, we unravel
subtle effects related to exchange interactions and their role in promoting
quantum coherence.
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