43 citations · 160 across the 9 of their papers we have counts for
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The Wigner Kernel of a Particle obtained from the Wigner Kernel of a Spin by Group Theoretical Contraction
Jean-Pierre Amiet, Stefan Weigert
The Moyal formalism for a particle can be derived from the Moyal formalism for a spin. This is done by contracting the group of rotations to the oscillator group. A new derivation…
Contracting the Wigner-Kernel of a Spin to the Wigner-Kernel of a Particle
Jean-Pierre Amiet, Stefan Weigert
A general relation between the Moyal formalisms for a spin and a particle is established. Once the formalism has been set up for a spin, the phase-space description of a particle i…
Discrete Q- and P-symbols for spin s
Jean-Pierre Amiet, Stefan Weigert
Non-orthogonal bases of projectors on coherent states are introduced to expand hermitean operators acting on the Hilbert space of a spin s. It is shown that the expectation values…
Coherent States and the Reconstruction of Pure Spin States
Jean-Pierre Amiet, Stefan Weigert
Coherent states provide an appealing method to reconstruct efficiently a pure state of a quantum mechanical spin s. A Stern-Gerlach apparatus is used to measure (4s+1) expectations…
Reconstructing the density matrix of a spin s through Stern-Gerlach measurements (II)
Jean-Pierre Amiet, Stefan Weigert
The density matrix of a spin s is fixed uniquely if the probabilities to obtain the value s upon measuring n.S are known for 4s(s+1) appropriately chosen directions n in space. The…
Reconstructing a pure state of a spin s through three Stern-Gerlach measurements
Jean-Pierre Amiet, Stefan Weigert
Consider a spin s prepared in a pure state. It is shown that, generically, the moduli of the (2s+1) spin components along three directions in space determine the state unambiguousl…