Optimal unbiased state characterization

Abstract

Abstract. We propose a general approach to characterize states of a bipartite system composed by a fully controllable and an unaccessible subsystems. The method is based on the measuring interference between states of the uncontrollable subsystem obtained after projecting an appropriately transformed bipartite state on the basis of the accessible subsystem by local operations.

MUB-like structures and tomographic reconstruction for N-ququart systems

“…Discrete quantum systems, i.e. systems with a finite number of energy levels subjected only to Clifford-type physical operations (those that preserve the generalized Pauli group), play a fundamental role in a wide range of quantum information protocols as teleportation, quantum key distribution, error correction codes [1,2,3,4,5] and in problems related to state characterization and quantum tomography [6,7]. In most experiments related to information transmission, only two level systems (qubits) are involved.…”

MUB-like structures and tomographic reconstruction for N-ququart systems

“…Discrete quantum systems, i.e. systems with a finite number of energy levels subjected only to Clifford-type physical operations (those that preserve the generalized Pauli group), play a fundamental role in a wide range of quantum information protocols as teleportation, quantum key distribution, error correction codes [1][2][3][4][5] and in problems related to state characterization and quantum tomography [6,7]. In most experiments related to information transmission, only two level systems (qubits) are involved.…”