Title
A quantum linearity test for robustly verifying entanglement.
Abstract
We introduce a simple two-player test which certifies that the players apply tensor products of Pauli σX and σZ observables on the tensor product of n EPR pairs. The test has constant robustness: any strategy achieving success probability within an additive of the optimal must be poly(ε)-close, in the appropriate distance measure, to the honest n-qubit strategy. The test involves 2n-bit questions and 2-bit answers. The key technical ingredient is a quantum version of the classical linearity test of Blum, Luby, and Rubinfeld. As applications of our result we give (i) the first robust self-test for n EPR pairs; (ii) a quantum multiprover interactive proof system for the local Hamiltonian problem with a constant number of provers and classical questions and answers, and a constant completeness-soundness gap independent of system size; (iii) a robust protocol for verifiable delegated quantum computation with a constant number of quantum polynomial-time provers sharing entanglement.
Year
DOI
Venue
2017
10.1145/3055399.3055468
STOC
Keywords
Field
DocType
Quantum Interactive Proofs,Self-Testing,Nonlocal Games,Quantum PCP Conjecture
Tensor product,Quantum,Discrete mathematics,Combinatorics,Observable,Quantum entanglement,Interactive proof system,Quantum mechanics,Quantum computer,Robustness (computer science),Mathematics,Pauli exclusion principle
Conference
ISSN
Citations 
PageRank 
Proc. of STOC '17, pp. 1003-1015 (2017)
2
0.38
References 
Authors
3
2
Name
Order
Citations
PageRank
Anand Natarajan1165.09
Thomas Vidick237731.69