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One-Way Ticket to Las Vegas and the Quantum Adversary

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arxiv 2301.02003 v1 pith:7OGZJHNM submitted 2023-01-05 quant-ph

classification quant-ph
keywords quantumadversaryinputaccessboundoraclesproblemquery
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We propose a new definition of quantum Las Vegas query complexity. We show that it is exactly equal to the quantum adversary bound. This is achieved by a new and very simple way of transforming a feasible solution to the adversary optimisation problem into a quantum query algorithm. This allows us to generalise the bound to include unidirectional access, multiple input oracles, and input oracles that are not unitary. As an application, we demonstrate a separation between unidirectional and bidirectional access to an input oracle for a rather natural unitary permutation inversion problem.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Time-Dependent Hamiltonian Simulation with Optimal Query Complexity

    quant-ph 2026-08 accept novelty 8.0 of 10

    For Lipschitz time-dependent Hamiltonians, the new algorithm uses O(alpha T + log(1/epsilon)/log(e + log(1/epsilon)/(alpha T))) HAM-T queries, matching the lower bound for time-independent simulation.

  2. Composing Quantum Algorithms

    quant-ph 2025-02 unverdicted novelty 2.0 of 10

    A survey explaining that bounded-error quantum algorithms can be composed without the log factor that classical randomized composition requires, using the transducer model.

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