Augmented Index and Quantum Streaming Algorithms for DYCK(2)

Authors Ashwin Nayak, Dave Touchette

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Ashwin Nayak
Dave Touchette

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Ashwin Nayak and Dave Touchette. Augmented Index and Quantum Streaming Algorithms for DYCK(2). In 32nd Computational Complexity Conference (CCC 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 79, pp. 23:1-23:21, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)


We show how two recently developed quantum information theoretic tools can be applied to obtain lower bounds on quantum information complexity. We also develop new tools with potential for broader applicability, and use them to establish a lower bound on the quantum information complexity for the Augmented Index function on an easy distribution. This approach allows us to handle superpositions rather than distributions over inputs, the main technical challenge faced previously. By providing a quantum generalization of the argument of Jain and Nayak [IEEE TIT'14], we leverage this to obtain a lower bound on the space complexity of multi-pass, unidirectional quantum streaming algorithms for the DYCK(2) language.
  • Quantum streaming algorithms
  • Space complexity
  • Quantum communication complexity
  • Quantum information cost
  • DYCK(2)
  • Augmented Index


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