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- W4282034211 abstract "We investigate the space complexity of two graph streaming problems: Max-Cut and its quantum analogue, Quantum Max-Cut. Previous work by Kapralov and Krachun [STOC `19] resolved the classical complexity of the emph{classical} problem, showing that any $(2 - varepsilon)$-approximation requires $Omega(n)$ space (a $2$-approximation is trivial with $textrm{O}(log n)$ space). We generalize both of these qualifiers, demonstrating $Omega(n)$ space lower bounds for $(2 - varepsilon)$-approximating Max-Cut and Quantum Max-Cut, even if the algorithm is allowed to maintain a quantum state. As the trivial approximation algorithm for Quantum Max-Cut only gives a $4$-approximation, we show tightness with an algorithm that returns a $(2 + varepsilon)$-approximation to the Quantum Max-Cut value of a graph in $textrm{O}(log n)$ space. Our work resolves the quantum and classical approximability of quantum and classical Max-Cut using $textrm{o}(n)$ space. We prove our lower bounds through the techniques of Boolean Fourier analysis. We give the first application of these methods to sequential one-way quantum communication, in which each player receives a quantum message from the previous player, and can then perform arbitrary quantum operations on it before sending it to the next. To this end, we show how Fourier-analytic techniques may be used to understand the application of a quantum channel." @default.
- W4282034211 created "2022-06-13" @default.
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- W4282034211 date "2022-05-31" @default.
- W4282034211 modified "2023-10-14" @default.
- W4282034211 title "The Quantum and Classical Streaming Complexity of Quantum and Classical Max-Cut" @default.
- W4282034211 doi "https://doi.org/10.48550/arxiv.2206.00213" @default.
- W4282034211 hasPublicationYear "2022" @default.
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