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Entanglement Witness Derived from NMR Superdense Coding
Robabeh Rahimi, Kazuyuki Takeda, Masanao Ozawa +1
We show that it is possible to transfer two-bit information via encoding a single qubit in a conventional nuclear magnetic resonance (NMR) experiment with two very weakly polarized…
Uncertainty principle for quantum instruments and computing
Masanao Ozawa
Recently, universally valid uncertainty relations have been established to set a precision limit for any instruments given a disturbance constraint in a form more general than the…
Quantum Limits of Measurement and Computing Induced by Conservation Laws and Uncertainty Relations
Masanao Ozawa
A quantitative extension of the Wigner-Araki-Yanase theorem is obtained on the limitation on precise, non-disturbing measurements of observables which do not commute with additive…
Quantum Measurement, Information, and Completely Positive Maps
Masanao Ozawa
Axiomatic approach to measurement theory is developed. All the possible statistical properties of apparatuses measuring an observable with nondegenerate spectrum allowed in standar…
Quantum subroutine problem and the robustness of quantum complexity classes
Harumichi Nishimura, Masanao Ozawa
This paper positively solves the quantum subroutine problem for fully quantum oracles. The quantum subroutine problem asks whether a quantum computer with an efficiently computable…
Computational Complexity of Uniform Quantum Circuit Families and Quantum Turing Machines
Harumichi Nishimura, Masanao Ozawa
Deutsch proposed two sorts of models of quantum computers, quantum Turing machines (QTMs) and quantum circuit families (QCFs). In this paper we explore the computational powers of…