Zobrazeno 1 - 10
of 211
pro vyhledávání: '"Toschek, P."'
Autor:
Wallentowitz, S., Toschek, P. E.
The recoil effects of spontaneous photon emissions during optical pumping of a trapped three-level atom are exactly calculated. Without resort to the Lamb-Dicke approximation, and considering arbitrary detuning and saturation of the pump laser, the d
Externí odkaz:
http://arxiv.org/abs/0808.1272
Publikováno v:
Opt. Commun. 239, 109 (2004)
A novel robust mechanism for the generation of "trapping states" is shown to exist in the coupling of a two-level system with an oscillator, which is based on nonlinearities in the laser-induced vibronic coupling. This mechanism is exemplified with a
Externí odkaz:
http://arxiv.org/abs/quant-ph/0509103
Autor:
Wallentowitz, S., Toschek, P. E.
In the paper by M. Hotta and M. Morikawa [Phys. Rev. A 69, 052114 (2004)] the non-existence of the quantum Zeno effect caused by indirect measurements has been claimed. It is shown here that the pertinent proof is incorrect, and the claim unfounded.<
Externí odkaz:
http://arxiv.org/abs/quant-ph/0509098
Publikováno v:
Optics Communications Vol. 211, 235-241 (2002)
The driven evolution of the spin of an individual atomic ion on the ground-state hyperfine resonance is impeded by the observation of the ion in one of the pertaining eigenstates. Detection of resonantly scattered light identifies the ion in its uppe
Externí odkaz:
http://arxiv.org/abs/quant-ph/0406027
The optimal estimation of a quantum mechanical 2-state system (qubit) - with N identically prepared qubits available - is obtained by measuring all qubits simultaneously in an entangled basis. We report the experimental estimation of qubits using a s
Externí odkaz:
http://arxiv.org/abs/quant-ph/0110068
Publikováno v:
Laser Physics 12, 729-735 (2002)
Quantum information processing (QIP) requires thorough assessment of decoherence. Atoms or ions prepared for QIP often become addressed by radiation within schemes of alternating microwave-optical double resonance. A well-defined amount of decoherenc
Externí odkaz:
http://arxiv.org/abs/quant-ph/0109037
Publikováno v:
Z. Naturforsch. 56a, 160-164 (2001)
A quantum system being observed evolves more slowly. This `'quantum Zeno effect'' is reviewed with respect to a previous attempt of demonstration, and to subsequent criticism of the significance of the findings. A recent experiment on an {\it individ
Externí odkaz:
http://arxiv.org/abs/quant-ph/0108040
Publikováno v:
Opt. Comm. 180 (2000) 115-120
The evolution of a quantum system is supposed to be impeded by measurement of an involved observable. This effect has been proven indistinguishable from the effect of dephasing the system's wave function, except in an individual quantum system. The c
Externí odkaz:
http://arxiv.org/abs/quant-ph/0105004
Publikováno v:
Phys. Rev. A 65 (2002) 053401
We study cooling of the collective vibrational motion of two 138Ba+ ions confined in an electrodynamic trap and irradiated with laser light close to the resonances S_1/2-P_1/2 (493 nm) and P_1/2-D_3/2 (650 nm). The motional state of the ions is monit
Externí odkaz:
http://arxiv.org/abs/quant-ph/0104002
Publikováno v:
European Physical Journal D 14, 387-396 (2001)
The evolution of a quantum system under observation becomes retarded or even impeded. We review this ``quantum Zeno effect'' in the light of the criticism that has been raised upon a previous attempt to demonstrate it, of later reexaminations of both
Externí odkaz:
http://arxiv.org/abs/quant-ph/0009021