Optimal universal quantum cloning and state estimation
(1997)
Quantum Algorithms Revisited
ArXiv quant-ph/9708016 (1997)
Abstract:
Quantum computers use the quantum interference of different computational paths to enhance correct outcomes and suppress erroneous outcomes of computations. A common pattern underpinning quantum algorithms can be identified when quantum computation is viewed as multi-particle interference. We use this approach to review (and improve) some of the existing quantum algorithms and to show how they are related to different instances of quantum phase estimation. We provide an explicit algorithm for generating any prescribed interference pattern with an arbitrary precision.Quantum Algorithms Revisited
(1997)
Universal Algorithm for Optimal Estimation of Quantum States from Finite Ensembles
ArXiv quant-ph/9707028 (1997)
Abstract:
We present a universal algorithm for the optimal quantum state estimation of an arbitrary finite dimensional system. The algorithm specifies a physically realizable positive operator valued measurement (POVM) on a finite number of identically prepared systems. We illustrate the general formalism by applying it to different scenarios of the state estimation of N independent and identically prepared two-level systems (qubits).Universal Algorithm for Optimal Estimation of Quantum States from Finite Ensembles
(1997)