14 citations · 19 across the 4 of their papers we have counts for
6 papers
Deriving Tight Bell Inequalities for 2 Parties with Many 2-valued Observables from Facets of Cut Polytopes
David Avis, Hiroshi Imai, Tsuyoshi Ito +1
Relatively few families of Bell inequalities have previously been identified. Some examples are the trivial, CHSH, I_{mm22}, and CGLMP inequalities. This paper presents a large num…
Qubit Channels Which Require Four Inputs to Achieve Capacity: Implications for Additivity Conjectures
Masahito Hayashi, Hiroshi Imai, Keiji Matsumoto +2
An example is given of a qubit quantum channel which requires four inputs to maximize the Holevo capacity. The example is one of a family of channels which are related to 3-state c…
Simulating the Effects of Quantum Error-correction Schemes
Jumpei Niwa, Keiji Matsumoto, Hiroshi Imai
It is important to protect quantum information against decoherence and operational errors, and quantum error-correcting (QEC) codes are the keys to solving this problem. Of course,…
Dualistic computational algebraic analyses of primal and dual minimum cost flow problems on acyclic tournament graphs
Takayuki Ishizeki, Hiroki Nakayama, Hiroshi Imai
To integer programming problems, computational algebraic approaches using Grobner bases or standard pairs via the discreteness of toric ideals have been studied in recent years. Al…
Two-way Quantum One-counter Automata
Tomohiro Yamasaki, Hirotada Kobayashi, Hiroshi Imai
After the first treatments of quantum finite state automata by Moore and Crutchfield and by Kondacs and Watrous, a number of papers study the power of quantum finite state automata…
A universal cloner allowing the input to be arbitrary states in symmetric subspace
Heng Fan, Keiji Matsumoto, Xiang-Bin Wang +2
A generalized universal quantum cloning machine is proposed which allows the input to be arbitrary states in symmetric subspace. And it reduces to the universal quantum cloning mac…