Better sensing with variable-range interactions
- URL: http://arxiv.org/abs/2307.06901v1
- Date: Thu, 13 Jul 2023 16:59:32 GMT
- Title: Better sensing with variable-range interactions
- Authors: Monika, Leela Ganesh Chandra Lakkaraju, Srijon Ghosh, Aditi Sen De
- Abstract summary: We propose a quantum sensor based on a variable-range many-body quantum spin chain with a moderate transverse magnetic field.
We report the threefold benefits of employing a long-range system as a quantum sensor.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The typical bound on parameter estimation, known as the standard quantum
limit (SQL), can be surpassed by exploiting quantum resources such as
entanglement. To estimate the magnetic probe field, we propose a quantum sensor
based on a variable-range many-body quantum spin chain with a moderate
transverse magnetic field. We report the threefold benefits of employing a
long-range system as a quantum sensor. Firstly, sensors with quasi long-range
interactions can always beat SQL for all values of the coordination number
while a sensor with long-range interactions does not have this ubiquitous
quantum advantage. Secondly, a long-range Hamiltonian outperforms a
nearest-neighbor (NN) Hamiltonian in terms of estimating precision. Finally, we
observe that the system with long-range interactions can go below SQL in the
presence of a high temperature of the initial state while sensors having NN
interactions cannot. Furthermore, a sensor based on the long-range Ising
Hamiltonian proves to be robust against impurities in the magnetic field and
when the time-inhomogeneous dephasing noise acts during interaction of the
probe with the system.
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