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7 papers · 1 filter
Optimal state estimation for d-dimensional quantum systems
D. Bruss, C. Macchiavello
We establish a connection between optimal quantum cloning and optimal state estimation for d-dimensional quantum systems. In this way we derive an upper limit on the fidelity of st…
Symmetrizing Evolutions
Paolo Zanardi
We introduce quantum procedures for making -invariant the dynamics of an arbitrary quantum system S, where is a finite group acting on the space state of S. Severa…
Subdecoherent Information Encoding in a Quantum-Dot Array
Paolo Zanardi, Fausto Rossi
A potential implementation of quantum-information schemes in semiconductor nanostructures is studied. To this end, the formal theory of quantum encoding for avoiding errors is reca…
Optimal eavesdropping in quantum cryptography with six states
Dagmar Bruss
A generalization of the quantum cryptographic protocol by Bennett and Brassard is discussed, using three conjugate bases, i.e. six states. By calculating the optimal mutual informa…
Quantum Information in Semiconductors: Noiseless Encoding in a Quantum-Dot Array
Paolo Zanardi, Fausto Rossi
A potential implementation of quantum-computation schemes in semiconductor-based structures is proposed. In particular, an array of quantum dots is shown to be an ideal quantum reg…
Quantum Cloning in dimensions
Paolo Zanardi
The quantum state space over a -dimensional Hilbert space is represented as a convex subset of a -dimensional sphere , where …