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- W3048153015 abstract "Non-signaling proofs, motivated by quantum computation, have found applications in cryptography and hardness of approximation. An important open problem is characterizing the power of no-signaling proofs. It is known that 2-prover no-signaling proofs are characterized by PSPACE, and that no-signaling proofs with poly(n)-provers are characterized by EXP. However, the power of k-prover no-signaling proofs, for 2kpoly(n) remained an open problem. We show that k-prover no-signaling proofs (with negligible soundness) for k=O(√logn) are contained in PSPACE. We prove this via two different routes that are of independent interest. In both routes we consider a relaxation of no-signaling called sub-no-signaling. Our main technical contribution (which is used in both our proofs) is a reduction showing how to convert any sub-no-signaling strategy with value at least 1−2−Ω(k2) into a no-signaling one with value at least 2−O(k2). In the first route, we show that the classical prover reduction method for converting k-prover games into 2-prover games carries over to the no-signaling setting with the following loss in soundness: if a k-player game has value less than 2−ck2 (for some constant~c>0), then the corresponding 2-prover game has value at most 1−2dk2 (for some constant~d>0). In the second route we show that the value of a sub-no-signaling game can be approximated in space that is polynomial in the communication complexity and exponential in the number of provers." @default.
- W3048153015 created "2020-08-13" @default.
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- W3048153015 creator A5081254473 @default.
- W3048153015 date "2020-06-01" @default.
- W3048153015 modified "2023-09-26" @default.
- W3048153015 title "Non-Signaling Proofs with O(√log n) Provers is in PSPACE" @default.
- W3048153015 hasPublicationYear "2020" @default.
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