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- C. Adami
- IEEE Trans. Evolutionary Computation
- 1998

We present a new tierra-inspired artiicial life system with local interactions and two-dimensional geometry , based on an update mechanism akin to that of 2D cellular automata. We nd that the spatial geometry is conducive to the development of diversity and thus improves adaptive capabilities. We also demonstrate the adaptive strength of the system by… (More)

- C. Adami, N. J. Cerf
- 1996

A practical measure for the complexity of sequences of symbols (“strings”) is introduced that is rooted in automata theory but avoids the problems of Kolmogorov–Chaitin complexity. This physical complexity can be estimated for ensembles of sequences, for which it reverts to the difference between the maximal entropy of the ensemble and the actual entropy… (More)

- N. J. Cerf, C. Adami
- 1997

A framework for a quantum mechanical information theory is introduced that is based entirely on density operators, and gives rise to a unified description of classical correlation and quantum entanglement. Unlike in classical (Shannon) information theory, quantum (von Neumann) conditional entropies can be negative when considering quantum entangled systems,… (More)

- C. Adami, N. J. Cerf
- 1997

We discuss the capacity of quantum channels for information transmission and storage. Quantum channels have dual uses: they can be used to transmit known quantum states which code for classical information, and they can be used in a purely quantum manner, for transmitting or storing quantum entanglement. We propose here a definition of the von Neumann… (More)

We present a quantum intbrmation theory that allows for a consistent description of entanglement. It parallels classical (Shannon) information theory but is based entirely on density matrices rather than probability distributions for the description of quantum ensembles. We find that quantum (von Neumann) conditional entropies can be negative for entangled… (More)

- Chris Adami
- 1994

We describe and investigate the learning capabilities displayed by a population of self-replicating segments of computer code subject to random mutation: the tierra environment. We find that learning is achieved through phase transitions that adapt the population to the environment it encounters, at a rate characterized by external parameters such as… (More)

- N. J. Cerf, C. Adami, P. G. Kwiat
- 1998

A constructive method for simulating small-scale quantum circuits by use of linear optical devices is presented. It relies on the representation of several quantum bits by a single photon, and on the implementation of universal quantum gates using simple optical components ~beam splitters, phase shifters, etc.!. This suggests that the optical realization of… (More)

- Chris Adami
- 1994

We present a theoretical as well as experimental investigation of a population of self-replicating segments of code subject to random mutation and survival of the ttest. Under the assumption that such a system constitutes a minimal system with characteristics of life, we obtain a number of statements on the evolution of complexity and the trade-oo between… (More)

- Chris Adami
- 1994

We present a new tierra-inspired arti cial life system with local interactions and two-dimensional geometry, based on an update mechanism akin to that of 2D cellular automata. We nd that the spatial geometry is conducive to the development of diversity and thus improves adaptive capabilities. We also demonstrate the adaptive strength of the system by… (More)