Measurement-device-independent nonlinear entanglement witnesses
- URL: http://arxiv.org/abs/2106.05796v2
- Date: Sun, 31 Oct 2021 10:56:20 GMT
- Title: Measurement-device-independent nonlinear entanglement witnesses
- Authors: Kornikar Sen, Chirag Srivastava, Ujjwal Sen
- Abstract summary: Entanglement witnesses are one of the most effective methods to detect entanglement.
Measurement-device-independent entanglement witnesses provide an escape from such measurement dependence.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Entanglement witnesses are one of the most effective methods to detect
entanglement. It is known that nonlinear entanglement witnesses provide better
entanglement detection than their linear counterparts, in that the former
detect a strictly larger subset of entangled states than the latter. Whether
linear or nonlinear, the method is measurement-device dependent, so that
imperfect measurements may cause false certification of entanglement in a
shared state. Measurement-device-independent entanglement witnesses provide an
escape from such measurement dependence of the entanglement detection for
linear entanglement witnesses. Here we present measurement-device-independent
nonlinear entanglement witnesses for non-positive partial transpose entangled
states as well as for bound entangled states with positive partial transpose.
The constructed measurement-device-independent nonlinear entanglement witnesses
certify the entanglement of the same sets of entangled states as their
device-dependent parents do, and therefore are better than the linear
entanglement witnesses, device-independent or otherwise.
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