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Exponential separation of quantum and classical one-way communication complexity

Published: 13 June 2004 Publication History

Abstract

We give the first exponential separation between quantum and bounded-error randomized one-way communication complexity. Specifically, we define the Hidden Matching Problem HMn: Alice gets as input a string x ∈ (0, 1)n and Bob gets a perfect matching M on the n coordinates. Bob's goal is to output a tuple [i,j,b] such that the edge (i,j) belongs to the matching M and b = xi ⊕ xj. We prove that the quantum one-way communication complexity of HMn is O(log n), yet any randomized one-way protocol with bounded error must use Ω(√n) bits of communication. No asymptotic gap for one-way communication was previously known. Our bounds also hold in the model of Simultaneous Messages (SM) and hence we provide the first exponential separation between quantum SM and randomized SM with public coins.For a Boolean decision version of HMn, we show that the quantum one-way communication complexity remains O(log n) and that the 0-error randomized one-way communication complexity is Ω(n). We prove that any randomized linear one-way protocol with bounded error for this problem requires Ω(√[3] n log n) bits of communication.

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cover image ACM Conferences
STOC '04: Proceedings of the thirty-sixth annual ACM symposium on Theory of computing
June 2004
660 pages
ISBN:1581138520
DOI:10.1145/1007352
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Publication History

Published: 13 June 2004

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Author Tags

  1. communication complexity
  2. hidden matching
  3. quantum computation
  4. separation

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STOC04
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STOC04: Symposium of Theory of Computing 2004
June 13 - 16, 2004
IL, Chicago, USA

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Overall Acceptance Rate 1,469 of 4,586 submissions, 32%

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  • (2023)Streaming Euclidean MST to a Constant FactorProceedings of the 55th Annual ACM Symposium on Theory of Computing10.1145/3564246.3585168(156-169)Online publication date: 2-Jun-2023
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