Proposal for a solid-state magnetoresistive Larmor quantum clock
- URL: http://arxiv.org/abs/2112.02245v1
- Date: Sat, 4 Dec 2021 04:59:37 GMT
- Title: Proposal for a solid-state magnetoresistive Larmor quantum clock
- Authors: Amal Mathew, Kerem Y Camsari and Bhaskaran Muralidharan
- Abstract summary: We propose a solid-state implementation of the Larmor clock that exploits tunnel magnetoresistance.
Our proposal takes into account the detrimental aspects of multiple reflections by incorporating multiple contacts.
We unravel that while the time-keeping aspect of the Larmor clock is reasonably undeterred due to momentum and phase relaxation processes, it degrades significantly in the presence of spin-dephasing.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We propose a solid-state implementation of the Larmor clock that exploits
tunnel magnetoresistance to distill information on how long itinerant spins
take to traverse a barrier embedded in it. Keeping in mind that the tunnelling
time innately involves pristine pre-selection and post-selection, our proposal
takes into account the detrimental aspects of multiple reflections by
incorporating multiple contacts, multiple current measurements and suitably
defined magnetoresistance signals. Our analysis provides a direct mapping
between the magnetoresistance signals and the tunneling times and aligns well
with the interpretation in terms of generalized quantum measurements and
quantum weak values. By means of an engineered pre-selection in one of the
ferromagnetic contacts, we also elucidate how one can make the measurement
"weak" by minimizing the back-action, while keeping the tunneling time
unchanged. We then analyze the resulting interpretations of the tunneling time
and the measurement back action in the presence of phase breaking effects that
are intrinsic to solid state systems. We unravel that while the time-keeping
aspect of the Larmor clock is reasonably undeterred due to momentum and phase
relaxation processes, it degrades significantly in the presence of
spin-dephasing. We believe that the ideas presented here also open up a
fructuous solid state platform to encompass emerging ideas in quantum
technology such as quantum weak values and its applications, that are currently
exclusive to quantum optics and cold atoms.
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