Henry Yuen: Parallel repetition for entangled games via fast quantum search

Speaker: Henry Yuen , MIT

Date: Wednesday, April 15, 2015

Time: 4:00 PM to 5:00 PM Note: all times are in the Eastern Time Zone

Public: Yes

Location: 32-G575

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Host: Ilya Razenshteyn

Contact: Rebecca Yadegar, ryadegar@csail.mit.edu

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Reminder Subject: TALK: Henry Yuen: Parallel repetition for entangled games via fast quantum search

Abstract: We give improved parallel repetition theorems for multiplayer, one-round games with entangled players, when the inputs to the players are uncorrelated. We do so by exploiting a novel connection between communication protocols and quantum parallel repetition, first explored by Chailloux and Scarpa: by taking advantage of fast quantum protocols for distributed search, we show that for this class of games (called free games), the entangled value of the n-fold repetition decays as (1 - eps^{3/2})^{\Omega(n/s)}, where 1 - eps is the entangled value of the original game, and s is the output alphabet size.

In contrast, the best known parallel repetition theorem for free games (due to Barak, et al.) in the classical setting is that the n-fold repetition value is bounded by (1 - eps^2)^{\Omega(n/s)}, suggesting the possibility of a separation between the behavior of quantum and classical games under parallel repetition.

Our proof takes advantage of the Aaronson-Ambainis quantum search protocol, and a general theorem of Nayak and Salzman that bounds the ability of parties to convey classical messages using two-way quantum communication.

Joint work with Kai-Min Chung and Xiaodi Wu.

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Created by Rebecca Yadegar Email at Monday, April 13, 2015 at 2:18 PM.