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Violation of space-time Bell-CHSH inequality beyond Tsirelson bound via post selection and quantum cryptography

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Paper breakdownThe authors' claims, conditions and measurements, as JSON Signed receiptProof this review has not been altered
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C S Sudheer Kumar

Quantum Physics · Submitted 17 Feb 2017

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim Here we show that, if we insert context dependent unitary evolutions (which can be achieved via post selection) into spatial (i.e., normal) Bell-CHSH test, then it is possible to violate space-time Bell-CHSH inequality maximally (i.e., up to $4$).

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arXiv ID1702.05479 (version 1)
Pith IDU3XQ5NLA, Pith's permanent record of this paper and its review
CitationC S Sudheer Kumar. "Violation of space-time Bell-CHSH inequality beyond Tsirelson bound via post selection and quantum cryptography." arXiv:1702.05479 (2017). https://pith.science/paper/U3XQ5NLA
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The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,031 input tokens.

What the abstract itself states, as probabilities: claims first 0.06 · states limitation 0.74 · human participants 0.03 · controlled comparison 0.07 · randomized assignment 0.02 · states quantitative result 0.98 · compares with prior results 0.87 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

Here we show that, if we insert context dependent unitary evolutions (which can be achieved via post selection) into spatial (i.e., normal) Bell-CHSH test, then it is possible to violate space-time Bell-CHSH inequality maximally (i.e., up to $4$). However this does not contradict Tsirelson quantum bound ($2\sqrt{2}$), as the latter has been derived without taking into consideration context dependent unitary evolutions and/or post selection. As an important application, this leads to a more efficient quantum key distribution protocol.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 Here we show that, if we insert context dependent unitary evolutions (which can be achieved via post selection) into spatial (i.e., normal) Bell-CHSH test, then it is possible to violate space-time Bell-CHSH inequality maximally (i.e., up to $4$). result 0.91 0.86 0.87 asserted 0.76
s1 However this does not contradict Tsirelson quantum bound ($2\sqrt{2}$), as the latter has been derived without taking into consideration context dependent unitary evolutions and/or post selection. interpretation 0.93 0.32 0.15 asserted 1.00
s2 As an important application, this leads to a more efficient quantum key distribution protocol. interpretation 0.71 0.66 0.10 asserted 0.97

What kind of paper the classifier reports this is: theoretical result 0.98 · evidence from proof or derivation 0.77.

What was examined, and what was not

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  • full text
  • figures and tables
  • references and citing sentences
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  • P abstract
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  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

Here we show that, if we insert context dependent unitary evolutions (which can be achieved via post selection) into spatial (i.e., normal) Bell-CHSH test, then it is possible to violate space-time Bell-CHSH inequality maximally (i.e., up to $4$). However this does not contradict Tsirelson quantum bound ($2\sqrt{2}$), as the latter has been derived without taking into consideration context dependent unitary evolutions and/or post selection. As an important application, this leads to a more efficient quantum key distribution protocol.

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