Quantum teleportation of quantum causal structures
- URL: http://arxiv.org/abs/2203.00433v1
- Date: Tue, 1 Mar 2022 13:29:09 GMT
- Title: Quantum teleportation of quantum causal structures
- Authors: Marius Krumm, Philippe Allard Gu\'erin, Thomas Zauner, \v{C}aslav
Brukner
- Abstract summary: We develop quantum teleportation of arbitrary quantum causal structures.
The central idea is to just teleport the inputs to and outputs from the operations of agents.
We prove that our partially post-selected teleportation protocol is compatible with all quantum causal structures.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum teleportation is a very helpful information-theoretic protocol that
allows to transfer an unknown arbitrary quantum state from one location to
another without having to transmit the quantum system through the intermediate
region. Quantum states, quantum channels, and indefinite causal structures are
all examples of quantum causal structures that not only enable advanced quantum
information processing functions, but can also model causal structures in
nonclassical spacetimes. In this letter, we develop quantum teleportation of
arbitrary quantum causal structures, as formalized by the process matrix
framework. Instead of teleporting all the physical degrees of freedom that
implement the causal structure, the central idea is to just teleport the inputs
to and outputs from the operations of agents. The communication of outcomes of
Bell state measurements, which is necessary for deterministic quantum
teleportation, is not possible for all causal structures that one might wish to
investigate. To avoid this problem, we propose partially and fully
post-selected teleportation protocols. We prove that our partially
post-selected teleportation protocol is compatible with all quantum causal
structures, including those that involve indefinite causal order.
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