Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Signaling to the Past Using P-CTCS   Closed Timelike Curves (CTCs) are intriguing relativistic objects that allow
for time travel to the past and can be used as computational resources. In
Deutschian Closed Timelike Curves (D-CTCs), due to the monogamy of
entanglement, non-local correlations between entangled states are destroyed. In
contrast, for Postselected Closed Timelike Curves (P-CTCs), a second variant of
CTCs, the non-local correlations are preserved. P-CTCs can be harnessed for the
signaling of non-orthogonal states to the past without a disruption of
causality. In this paper, we take up signaling to the past and show a method of
sending four non-orthogonal states to the past using P-CTCs. After constructing
our signaling protocol, we study the causality violations that our protocol
results in and put forward two consistency relations to prevent them.

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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: supr-con
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin