Physics Seminar
Date: Friday, 27 September 2024
Time: 11:45 AM
Venue: Seminar Hall
Causal classification of spatiotemporal quantum correlations
Varun Narasimhachar
Nanyang Technological University and Institute for High Performance Computing, Singapore.
27-09-24

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Abstract

From correlations in measurement outcomes alone, can two otherwise isolated parties establish whether such correlations are atemporal? That is, can they rule out that they have been given the same system at two different times? Classical statistics says no, yet quantum theory disagrees. Here, we introduce the necessary and sufficient conditions by which such quantum correlations can be identified as atemporal. We demonstrate the asymmetry of atemporality under time reversal and reveal it to be a measure of spatial quantum correlation distinct from entanglement. Our results indicate that certain quantum correlations possess an intrinsic arrow of time and enable classification of general quantum correlations across space-time based on their (in)compatibility with various underlying causal structures.

Towards the end I can also talk about my speculated antidote to the black hole information paradox using pseudo-density operators.