5,776 research outputs found
Learning Behavioural Context
The original publication is available at www.springerlink.co
The SLH framework for modeling quantum input-output networks
Many emerging quantum technologies demand precise engineering and control
over networks consisting of quantum mechanical degrees of freedom connected by
propagating electromagnetic fields, or quantum input-output networks. Here we
review recent progress in theory and experiment related to such quantum
input-output networks, with a focus on the SLH framework, a powerful modeling
framework for networked quantum systems that is naturally endowed with
properties such as modularity and hierarchy. We begin by explaining the
physical approximations required to represent any individual node of a network,
eg. atoms in cavity or a mechanical oscillator, and its coupling to quantum
fields by an operator triple . Then we explain how these nodes can be
composed into a network with arbitrary connectivity, including coherent
feedback channels, using algebraic rules, and how to derive the dynamics of
network components and output fields. The second part of the review discusses
several extensions to the basic SLH framework that expand its modeling
capabilities, and the prospects for modeling integrated implementations of
quantum input-output networks. In addition to summarizing major results and
recent literature, we discuss the potential applications and limitations of the
SLH framework and quantum input-output networks, with the intention of
providing context to a reader unfamiliar with the field.Comment: 60 pages, 14 figures. We are still interested in receiving
correction
Capacity of DNA Data Embedding Under Substitution Mutations
A number of methods have been proposed over the last decade for encoding
information using deoxyribonucleic acid (DNA), giving rise to the emerging area
of DNA data embedding. Since a DNA sequence is conceptually equivalent to a
sequence of quaternary symbols (bases), DNA data embedding (diversely called
DNA watermarking or DNA steganography) can be seen as a digital communications
problem where channel errors are tantamount to mutations of DNA bases.
Depending on the use of coding or noncoding DNA hosts, which, respectively,
denote DNA segments that can or cannot be translated into proteins, DNA data
embedding is essentially a problem of communications with or without side
information at the encoder. In this paper the Shannon capacity of DNA data
embedding is obtained for the case in which DNA sequences are subject to
substitution mutations modelled using the Kimura model from molecular evolution
studies. Inferences are also drawn with respect to the biological implications
of some of the results presented.Comment: 22 pages, 13 figures; preliminary versions of this work were
presented at the SPIE Media Forensics and Security XII conference (January
2010) and at the IEEE ICASSP conference (March 2010
Fault Tolerant Filtering and Fault Detection for Quantum Systems Driven By Fields in Single Photon States
The purpose of this paper is to solve a fault tolerant filtering and fault
detection problem for a class of open quantum systems driven by a
continuous-mode bosonic input field in single photon states when the systems
are subject to stochastic faults. Optimal estimates of both the system
observables and the fault process are simultaneously calculated and
characterized by a set of coupled recursive quantum stochastic differential
equations.Comment: arXiv admin note: text overlap with arXiv:1504.0678
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