Improved Direct Product Theorems for Randomized Query Complexity

TL;DR

This paper establishes optimal direct product theorems in randomized query complexity, showing how success probability diminishes exponentially with the number of inputs, and introduces new techniques applicable to various computational models.

Contribution

The paper proves a new, essentially optimal direct product theorem for query complexity, improving previous bounds and introducing a general martingale-based proof technique.

Findings

Success probability decreases exponentially with the number of inputs.

New XOR lemma and threshold direct product theorems derived.

Method applies to learning, search, and dynamic interaction problems.

Abstract

The direct product problem is a fundamental question in complexity theory which seeks to understand how the difficulty of computing a function on each of k independent inputs scales with k. We prove the following direct product theorem (DPT) for query complexity: if every T-query algorithm has success probability at most 1 - eps in computing the Boolean function f on input distribution Mu, then for alpha <= 1, every (alpha eps Tk)-query algorithm has success probability at most (2^{alpha eps}(1 - eps))^k in computing the k-fold direct product f^k correctly on k independent inputs from Mu. In light of examples due to Shaltiel, this statement gives an essentially optimal tradeoff between the query bound and the error probability. As a corollary, we show that for an absolute constant alpha > 0, the worst-case success probability of any (alpha R_2(f)k)-query randomized algorithm for f^k falls exponentially with k. The best previous statement of this type, due to Klauck, Spalek, and de Wolf, required a query bound of O(bs(f)k). The proof involves defining and analyzing a collection of martingales associated with an algorithm attempting to solve f^k. Our method is quite general and yields a new XOR lemma and threshold DPT for the query model, as well as DPTs for the query complexity of learning tasks, search problems, and tasks involving interaction with dyamic entities. We also give a version of our DPT in which decision tree size is the resource of interest.