Harvesting Entanglement by non-identical detectors with different energy
gaps
- URL: http://arxiv.org/abs/2204.01219v1
- Date: Mon, 4 Apr 2022 03:10:15 GMT
- Title: Harvesting Entanglement by non-identical detectors with different energy
gaps
- Authors: Hui Hu, Jialin Zhang and Hongwei Yu
- Abstract summary: It has been shown that vacuum entanglement can be harvested by a pair of initially uncorrelated detectors interacting locally with the vacuum field for a finite time.
In this paper, we examine the entanglement harvesting phenomenon of two non-identical inertial detectors with different energy gaps.
Our results suggest that the non-identical detectors may be advantageous to extracting entanglement from vacuum in certain circumstances as compared to identical detectors.
- Score: 3.4925971772712154
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: It has been shown that the vacuum state of a free quantum field is entangled
and such vacuum entanglement can be harvested by a pair of initially
uncorrelated detectors interacting locally with the vacuum field for a finite
time. In this paper, we examine the entanglement harvesting phenomenon of two
non-identical inertial detectors with different energy gaps locally interacting
with massless scalar fields via a Gaussian switching function. We focus on how
entanglement harvesting depends on the energy gap difference from two
perspectives: the amount of entanglement harvested and the
harvesting-achievable separation between the two detectors. In the sense of the
amount of entanglement, we find that as long as the inter-detector separation
is not too small with respect to the interaction duration parameter, two
non-identical detectors could extract more entanglement from the vacuum state
than the identical detectors. There exists an optimal value of the energy gap
difference when the inter-detector separation is sufficiently large that
renders the harvested entanglement to peak. Regarding the harvesting-achievable
separation, we further find that the presence of an energy gap difference
generally enlarges the harvesting-achievable separation range. Our results
suggest that the non-identical detectors may be advantageous to extracting
entanglement from vacuum in certain circumstances as compared to identical
detectors.
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