2 research outputs found
Multiparty hierarchical quantum-information splitting
We propose a scheme for multiparty hierarchical quantum-information splitting
(QIS) with a multipartite entangled state, where a boss distributes a secret
quantum state to two grades of agents asymmetrically. The agents who belong to
different grades have different authorities for recovering boss's secret.
Except for boss's Bell-state measurement, no nonlocal operation is involved.
The presented scheme is also shown to be secure against eavesdropping. Such a
hierarchical QIS is expected to find useful applications in the field of modern
multipartite quantum cryptography.Comment: 6 pages, 2 table
Quantum Tasks in Minkowski Space
The fundamental properties of quantum information and its applications to
computing and cryptography have been greatly illuminated by considering
information-theoretic tasks that are provably possible or impossible within
non-relativistic quantum mechanics. I describe here a general framework for
defining tasks within (special) relativistic quantum theory and illustrate it
with examples from relativistic quantum cryptography and relativistic
distributed quantum computation. The framework gives a unified description of
all tasks previously considered and also defines a large class of new questions
about the properties of quantum information in relation to Minkowski causality.
It offers a way of exploring interesting new fundamental tasks and
applications, and also highlights the scope for a more systematic understanding
of the fundamental information-theoretic properties of relativistic quantum
theory