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We derive a lower bound for the optimal fidelity for deterministic cloning a set of n pure states. In connection with states estimation, we obtain a lower bound about average maximum correct states estimation probability.
We discuss the possibility of generating and detecting, by a tomographic reconstruction of the Wigner function, a macroscopic superposition of two coherent states. The superposition state is created using a conditioned measurement on the polarisation of a probe photon entangled to a coherent...
Starting from the Generating functional for the Green Function (GF), constructed from the Lagrangian action in the Duffin–Kemmer–Petiau (DKP) theory ( L -approach) we strictly prove that the physical matrix elements of the S-matrix in DKP and Klein–Gordon–Fock (KGF) theories coincide in...
We present an entanglement purification protocol based on controlled–controlled-NOT operations and Bell state measurements. We show that the protocol is more efficient than the standard protocol of Bennett et al. (Phys. Rev. Lett. 76 (1996) 722).
The compound Mn III ((pyrol) 3 tren) where (pyrol) 3 tren is the trianionic Schiff base resulting from the condensation of pyrolle-2-carboxaldehyde with 2,2′,2′′-tris(ethylamino)amine exhibits an abrupt LS ( S =1) ↔ HS ( S =2) spin conversion with an inversion temperature in low field of...
We discuss two nonlocal models of electrodynamics in which the nonlocality is induced by the acceleration of the observer. Such an observer actually measures an electromagnetic field that exhibits persistent memory effects. We compare Mashhoon's model with a new ansatz developed here in the...
Tb 3+ -doped zinc oxide nanocrystals with a hexagonal wurzite structure were successfully prepared by reaction between Zn–O–Tb precursors and LiOH in ethanol. Good incorporation of Tb 3+ in ZnO nanocrystals is proved by XRD, FTIR, PL and PLE measurements. The presence of acetate complexes to...
We give two simple Kochen–Specker arguments for complementary between the position and momentum of spinless particles. The arguments work for systems with two and three degrees of freedom, and are formally analogous to those given by Peres and Mermin for two and three spin-1/2 particles, even...
First-order phase transitions that proceed via nucleation of bubbles are described by the homogeneous nucleation theory of Langer. The nucleation rate is one of the most interesting parameters of these transitions. In previous works we have computed nucleation rates with two different methods: (...
The imaginary part of the energy of the metastable state for the asymmetric double-well potential is calculated by using the path-integral method. The tunneling process is dominated by bounces.
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