Jorge Evers - Academia.edu (original) (raw)

Papers by Jorge Evers

Physical Review A, 2007

Decoherence-free subspaces (DFS) in systems of dipole-dipole interacting multi-level atoms are in... more Decoherence-free subspaces (DFS) in systems of dipole-dipole interacting multi-level atoms are investigated theoretically. It is shown that the collective state space of two dipole-dipole interacting four-level atoms contains a four-dimensional DFS. We describe a method that allows to populate the antisymmetric states of the DFS by means of a laser field, without the need of a field gradient between the two atoms. We identify these antisymmetric states as long-lived entangled states. Further, we show that any single-qubit operation between two states of the DFS can be induced by means of a microwave field. Typical operation times of these qubit rotations can be significantly shorter than for a nuclear spin system.

Physical Review Letters, 2006

The interplay of the concepts of complementarity and interference in the time-energy domain are s... more The interplay of the concepts of complementarity and interference in the time-energy domain are studied. In particular, we theoretically investigate the fluorescence light from a J = 1/2 to J= 1/2 transition that is driven by a monochromatic laser field. We find that the spectrum of resonance fluorescence exhibits a signature of vacuum-mediated interference effects, whereas the total intensity is not affected by interference. We demonstrate that this result is a consequence of the principle of complementarity, applied to time and energy. Since the considered level scheme can be found, e.g., in (198)Hg(+) ions, our model system turns out to be an ideal candidate to provide evidence for as yet experimentally unconfirmed vacuum-induced atomic coherences.

Physical Review Letters, 2008

A novel approach for the generation of subwavelength structures in interferometric optical lithog... more A novel approach for the generation of subwavelength structures in interferometric optical lithography is described. Our scheme relies on the preparation of the system in a position dependent trapping state via phase shifted standing wave patterns. Since this process only comprises resonant atom-field interactions, a multiphoton absorption medium is not required. The contrast of the induced pattern does only depend on the ratios of the applied field strengths such that our method in principle works at very low laser intensities.

Laser Physics, 2008

Various applications of ultraintense laser fields in particle physics, nuclear science, and quant... more Various applications of ultraintense laser fields in particle physics, nuclear science, and quantum electrodynamics are presented. We discuss laser-driven lepton-pair creation, photon splitting, high-harmonic generation from both vacuum and muonic atoms, and direct nuclear excitation. All of these processes may come into experimental reach by near-future laser technology.

Physical Review A, 2007

A two-mode single-atom laser is considered, with the aim of generating entanglement in macroscopi... more A two-mode single-atom laser is considered, with the aim of generating entanglement in macroscopic light. Two transitions in the four-level gain medium atom independently interact with the two cavity modes, while two other transitions are driven by control laser fields. Atomic relaxation as well as cavity losses are taken into account. We show that this system is a source of macroscopic entangled light over a wide range of control parameters and initial states of the cavity field.

Journal of Modern Optics, 2007

We investigate QED field-dependent effects in radiative shifts of atomic levels driven by a stron... more We investigate QED field-dependent effects in radiative shifts of atomic levels driven by a strong laser field. Our focus is on indirect laser-induced corrections to the Lamb shift of an atomic reference state due to a strong laser field which near-resonantly couples two other states, but not the reference state. Our aim is to show how to generalize previous treatments

Hay valores jurídicos? Cuáles son los valores jurídicos? Qué relación guardan entre sí? Son los v... more Hay valores jurídicos? Cuáles son los valores jurídicos? Qué relación guardan entre sí? Son los valores jurídicos fundamento del deber ser axiológico? Quiénes son los llamados a realizar los valores jurídicos? Tales con los problemas que demandarán nuestra atención en las líneas siguientes.

Physical Review A, 2007

Decoherence-free subspaces (DFS) in systems of dipole-dipole interacting multi-level atoms are in... more Decoherence-free subspaces (DFS) in systems of dipole-dipole interacting multi-level atoms are investigated theoretically. It is shown that the collective state space of two dipole-dipole interacting four-level atoms contains a four-dimensional DFS. We describe a method that allows to populate the antisymmetric states of the DFS by means of a laser field, without the need of a field gradient between the two atoms. We identify these antisymmetric states as long-lived entangled states. Further, we show that any single-qubit operation between two states of the DFS can be induced by means of a microwave field. Typical operation times of these qubit rotations can be significantly shorter than for a nuclear spin system.

Physical Review Letters, 2006

The interplay of the concepts of complementarity and interference in the time-energy domain are s... more The interplay of the concepts of complementarity and interference in the time-energy domain are studied. In particular, we theoretically investigate the fluorescence light from a J = 1/2 to J= 1/2 transition that is driven by a monochromatic laser field. We find that the spectrum of resonance fluorescence exhibits a signature of vacuum-mediated interference effects, whereas the total intensity is not affected by interference. We demonstrate that this result is a consequence of the principle of complementarity, applied to time and energy. Since the considered level scheme can be found, e.g., in (198)Hg(+) ions, our model system turns out to be an ideal candidate to provide evidence for as yet experimentally unconfirmed vacuum-induced atomic coherences.

Physical Review Letters, 2008

A novel approach for the generation of subwavelength structures in interferometric optical lithog... more A novel approach for the generation of subwavelength structures in interferometric optical lithography is described. Our scheme relies on the preparation of the system in a position dependent trapping state via phase shifted standing wave patterns. Since this process only comprises resonant atom-field interactions, a multiphoton absorption medium is not required. The contrast of the induced pattern does only depend on the ratios of the applied field strengths such that our method in principle works at very low laser intensities.

Laser Physics, 2008

Various applications of ultraintense laser fields in particle physics, nuclear science, and quant... more Various applications of ultraintense laser fields in particle physics, nuclear science, and quantum electrodynamics are presented. We discuss laser-driven lepton-pair creation, photon splitting, high-harmonic generation from both vacuum and muonic atoms, and direct nuclear excitation. All of these processes may come into experimental reach by near-future laser technology.

Physical Review A, 2007

A two-mode single-atom laser is considered, with the aim of generating entanglement in macroscopi... more A two-mode single-atom laser is considered, with the aim of generating entanglement in macroscopic light. Two transitions in the four-level gain medium atom independently interact with the two cavity modes, while two other transitions are driven by control laser fields. Atomic relaxation as well as cavity losses are taken into account. We show that this system is a source of macroscopic entangled light over a wide range of control parameters and initial states of the cavity field.

Journal of Modern Optics, 2007

We investigate QED field-dependent effects in radiative shifts of atomic levels driven by a stron... more We investigate QED field-dependent effects in radiative shifts of atomic levels driven by a strong laser field. Our focus is on indirect laser-induced corrections to the Lamb shift of an atomic reference state due to a strong laser field which near-resonantly couples two other states, but not the reference state. Our aim is to show how to generalize previous treatments

Hay valores jurídicos? Cuáles son los valores jurídicos? Qué relación guardan entre sí? Son los v... more Hay valores jurídicos? Cuáles son los valores jurídicos? Qué relación guardan entre sí? Son los valores jurídicos fundamento del deber ser axiológico? Quiénes son los llamados a realizar los valores jurídicos? Tales con los problemas que demandarán nuestra atención en las líneas siguientes.