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20 papers · 2 filters
Low-depth random Clifford circuits for quantum coding against Pauli noise using a tensor-network decoder
Andrew S. Darmawan, Yoshifumi Nakata, Shiro Tamiya +1
Recent work [M. J. Gullans et al., Physical Review X, 11(3):031066 (2021)] has shown that quantum error correcting codes defined by random Clifford encoding circuits can achieve a…
Smooth Metric Adjusted Skew Information Rates
Koji Yamaguchi, Hiroyasu Tajima
Metric adjusted skew information, induced from quantum Fisher information, is a well-known family of resource measures in the resource theory of asymmetry. However, its asymptotic…
Hunting for quantum-classical crossover in condensed matter problems
Nobuyuki Yoshioka, Tsuyoshi Okubo, Yasunari Suzuki +2
The intensive pursuit for quantum advantage in terms of computational complexity has further led to a modernized crucial question: {\it When and how will quantum computers outperfo…
Entanglement bipartitioning and tree tensor networks
Kouichi Okunishi, Hiroshi Ueda, Tomotoshi Nishino
We propose the entanglement bipartitioning approach to design an optimal network structure of the tree-tensor-network (TTN) for quantum many-body systems. Given an exact ground-sta…
Wigner-Araki-Yanase theorem for continuous and unbounded conserved observables
Yui Kuramochi, Hiroyasu Tajima
The Wigner-Araki-Yanase (WAY) theorem states that additive conservation laws imply the commutativity of exactly implementable projective measurements and the conserved observables…
Universal cost bound of quantum error mitigation based on quantum estimation theory
Kento Tsubouchi, Takahiro Sagawa, Nobuyuki Yoshioka
We present a unified approach to analyzing the cost of various quantum error mitigation methods on the basis of quantum estimation theory. By analyzing the quantum Fisher informati…