State Measurements with Short Laser Pulses and Lower-Efficiency Photon Detectors

Almut Beige; Gerhard C. Hegerfeldt

doi:10.1080/09500349708241875

Home/Archive/arXiv

arXiv · atom-ph/9607001

State Measurements with Short Laser Pulses and Lower-Efficiency Photon Detectors

Almut Beige·Gerhard C. Hegerfeldt

View original source ↗Read source document ↗Export metadata ↓

Abstract

It has been proposed by Cook (Phys. Scr. T 21, 49 (1988)) to use a short probe laser pulse for state measurements of two-level systems. In previous work we have investigated to what extent this proposal fulfills the projection postulate if ideal photon detectors are considered. For detectors with overall efficiency less than 1 complications arise for single systems, and for this case we present a simple criterion for a laser pulse to act as a state measurement and to cause an almost complete state reduction.

Explore related subjects

atom-ph physics.atom-ph quant-ph

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

Almut Beige, Gerhard C. Hegerfeldt. 1996-07-05. State Measurements with Short Laser Pulses and Lower-Efficiency Photon Detectors. https://doi.org/10.1080/09500349708241875

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv1997

An Atom Laser Based on Raman Transitions

In this paper we present an atom laser scheme using a Raman transition for the output coupling of atoms. A beam of thermal atoms (bosons) in a metastable atomic state $|1 >$ are pumped into a multimode atomic cavity. This cavity is coupled through spontaneous emission to a single mode of another cavity for the ground atomic state, $|2 >$. Above a certain threshold pumping rate a large number of atoms, $N_2$, builds up in this single quantum state and transitions to the ground state of the cavity become enhanced by a factor $(N_2 + 1)$. Atoms in this state are then coupled to the outside of the cavity with a Raman transition. This changes the internal state of the atom and imparts a momentum kick, allowing the atoms to leave the system.

atom-ph↗

arXiv1997

Analytic Description of the Motion of a Trapped Ion in an Even or Odd Coherent State

A completely analytic description is given of the motion of a trapped ion which is in either an even or an odd coherent state. Comparison to recent theoretical and experimental work is made.

atom-ph↗

arXiv1996

Direct Probing of Quantum Phase Space by Photon Counting

We propose a very simple experimental setup to measure, via photon counting, the overlap of the Wigner functions characterizing two single mode light beams. We show that this scheme can be applied to determine directly the phase space quasiprobability distribution of the single mode field and in a certain limit the Wigner function can be measured without use of tomographic reconstruction algorithms. The deleterious effects of non--unit photodetector efficiency are analyzed.

atom-ph↗