Subsystem distances between quasiparticle excited states

Distances between States and between Predicates

This paper gives a systematic account of various metrics on probability distributions (states) and on predicates. These metrics are described in a uniform manner using the validity relation between states and predicates. The standard adjunction between convex sets (of states) and effect modules (of predicates) is restricted to convex complete metric spaces and directed complete effect modules. ...

Polarized Distances between Quantum States and Observables

A scheme for construction of distances in any metrizable space is presented and applied to the sets of quantum states and observables. It is shown that many of the so far considered distances between quantum states can be casted in a general form of Euclidean distances between two points on the plane determined by the values of two suitably constructed functionals of states. The concept of stat...

Subsystem pseudopure states

A critical step in experimental quantum information processing QIP is to implement control of quantum systems protected against decoherence via informational encodings, such as quantum error-correcting codes, noiseless subsystems, and decoherence-free subspaces. These encodings lead to the promise of fault-tolerant QIP, but they come at the expense of resource overheads. Part of the challenge i...

Quasiparticle states in superconducting superlattices

Abstract. The energy bands and the global density of states are computed for superconductor / normalmetal superlattices in the clean limit. Dispersion relations are derived for the general case of insulating interfaces, including the mismatch of Fermi velocities and effective band masses. We focus on the influence of finite interface transparency and compare our results with those for transpare...

Multi-quasiparticle States in 256Rf