376 citations · 10.2k across the 275 of their papers we have counts for
6 papers · 1 filter
Cloning of symmetric d-level photonic states in physical systems
Heng Fan, Gregor Weihs, Keiji Matsumoto +1
Optimal procedures play an important role in quantum information. It turns out that some naturally occurring processes like emission of light from an atom can realize optimal trans…
A simple way to detect the state transition caused by the nondiagonal abelian Berry phase
X. B. Wang, K. Matsumoto, H. Fan +2
In a nondegenerate syste, the abelian Berry's phase will never cause transitions among the Hamiltonian's eigenstate. However, in a degenerate syatem, it is well known that the stat…
A universal cloner allowing the input to be arbitrary states in symmetric subspace
Heng Fan, Keiji Matsumoto, Xiang-Bin Wang +2
A generalized universal quantum cloning machine is proposed which allows the input to be arbitrary states in symmetric subspace. And it reduces to the universal quantum cloning mac…
Quantum Cloning Machines of a d-level System
Heng Fan, Keiji Matsumoto, Miki Wadati
The optimal N to M () quantum cloning machines for the d-level system are presented. The unitary cloning transformations achieve the bound of the fidelity.
A quantum-copying machine for equatorial qubits
Heng Fan, Xiang-Bin Wang, Keiji Matsumoto
Bužek and Hillery proposed a universal quantum-copying machine (UQCM) (i.e., transformation) to analyze the possibility of cloning arbitrary states. The UQCM copies quantum-mechani…
Quantum cloning machines for equatorial qubits
Heng Fan, Keiji Matsumoto, Xiang-Bin Wang +1
Quantum cloning machines for equatorial qubits are studied. For the case of 1 to 2 phase-covariant quantum cloning machine, we present the networks consisting of quantum gates to r…