We present the first detector capable of recording high-bandwidth real time atom number density m... more We present the first detector capable of recording high-bandwidth real time atom number density measurements of a Bose Einstein condensate. Based on a two-color Mach-Zehnder interferometer, our detector has a response time that is six orders of magnitude faster than current detectors based on CCD cameras while still operating at the shot-noise limit. With this minimally destructive system it may be possible to implement feedback to stabilize a Bose-Einstein condensate or an atom laser.
We present methods of transforming the standard quadrature amplitude squeezing of a continuous-wa... more We present methods of transforming the standard quadrature amplitude squeezing of a continuous-wave light beam to its Stokes parameters and transverse spatial modes statistics. These two states of light are called polarization squeezing and spatial squeezing, respectively. We present experimental results of the quadrature amplitude, polarization and spatial squeezing obtained with a common experimental setup based on optical parametric amplifiers. The transformations from quadrature amplitude to polarization and spatial squeezing are achieved with only simple linear optics.
Summary form only given. Optical parametric amplifiers (OPA) have been demonstrated previously as... more Summary form only given. Optical parametric amplifiers (OPA) have been demonstrated previously as a system capable of generating strongly squeezed states. The output from these systems is typically a "vacuum squeezed state" where the beam has no coherent amplitude. Such squeezed states may be used to improve the performance of optical measurements limited by quantum noise, or as reported, to facilitate QND measurements. The OPA is a monolithic MgO:LiNbO/sub 3/ crystal polished and coated on one side.
Abstract : The aim of our work is to realize the atomic storage of continuous variable quantum in... more Abstract : The aim of our work is to realize the atomic storage of continuous variable quantum information encoded in light fields. Following recent ideas, we propose a new scheme based on both Raman absorption and gradient echo and compare its efficacy with ...
Quantum Electronics and Laser Science Conference, 1999
We present in detail the limits and requisites to large observable squeezing from a below thresho... more We present in detail the limits and requisites to large observable squeezing from a below threshold optical parametric oscillator (OPO) and report more than 7 dB of quadrature squeezing measured from the vacuum output of a below threshold OPO. Two methods of transferring the vacuum squeezing onto a bright beam using the squeezed vacuum system are examined. The first method
Lasers and Electro-Optics Europe Conference on and European Quantum Electronics Conference, 2009
In this paper, simple demonstration was presented to produce and measure entanglement, all within... more In this paper, simple demonstration was presented to produce and measure entanglement, all within a single beam. Accessing and manipulating the expanded basis of transverse spatial modes makes this technology an interesting contender for optical quantum protocols.
Publisher Summary This chapter presents an experimental search for squeezing via four-wave mixing... more Publisher Summary This chapter presents an experimental search for squeezing via four-wave mixing in barium. The generation of squeezed light relies on the establishment of a suitable correlation between the fluctuations of two modes of a light field. This can be done by propagating both modes through a nonlinear medium. Four-wave mixing in an atomic medium is one of the nonlinearities that can be used to generate a non-classical, squeezed state of light. This chapter reports the experiments in barium using the lS- 1P transition in 138Ba. This two-level system might provide a stronger and easily describable nonlinearity than the already successful case of sodium, which is complicated by optical pumping. An apparent maximum in the magnitude of four-wave mixing is observed regarding the atomic density, detuning from atomic resonance and laser pump intensity, which would result in a suppression of the quantum noise of only 5% below the standard quantum limit.
A novel application of spectral line interferometry, giving spatial and temporal resolution of an... more A novel application of spectral line interferometry, giving spatial and temporal resolution of an atomic level population for a single event, is presented. Automated and accurate analysis of the interferogram is demonstrated using a fringe pattern analysis based on a two-dimensional Fourier transform. A measurement of an atomic level population in a laser produced barium plasma is used to illustrate these techniques.
We present the first detector capable of recording high-bandwidth real time atom number density m... more We present the first detector capable of recording high-bandwidth real time atom number density measurements of a Bose Einstein condensate. Based on a two-color Mach-Zehnder interferometer, our detector has a response time that is six orders of magnitude faster than current detectors based on CCD cameras while still operating at the shot-noise limit. With this minimally destructive system it may be possible to implement feedback to stabilize a Bose-Einstein condensate or an atom laser.
We present methods of transforming the standard quadrature amplitude squeezing of a continuous-wa... more We present methods of transforming the standard quadrature amplitude squeezing of a continuous-wave light beam to its Stokes parameters and transverse spatial modes statistics. These two states of light are called polarization squeezing and spatial squeezing, respectively. We present experimental results of the quadrature amplitude, polarization and spatial squeezing obtained with a common experimental setup based on optical parametric amplifiers. The transformations from quadrature amplitude to polarization and spatial squeezing are achieved with only simple linear optics.
Summary form only given. Optical parametric amplifiers (OPA) have been demonstrated previously as... more Summary form only given. Optical parametric amplifiers (OPA) have been demonstrated previously as a system capable of generating strongly squeezed states. The output from these systems is typically a "vacuum squeezed state" where the beam has no coherent amplitude. Such squeezed states may be used to improve the performance of optical measurements limited by quantum noise, or as reported, to facilitate QND measurements. The OPA is a monolithic MgO:LiNbO/sub 3/ crystal polished and coated on one side.
Abstract : The aim of our work is to realize the atomic storage of continuous variable quantum in... more Abstract : The aim of our work is to realize the atomic storage of continuous variable quantum information encoded in light fields. Following recent ideas, we propose a new scheme based on both Raman absorption and gradient echo and compare its efficacy with ...
Quantum Electronics and Laser Science Conference, 1999
We present in detail the limits and requisites to large observable squeezing from a below thresho... more We present in detail the limits and requisites to large observable squeezing from a below threshold optical parametric oscillator (OPO) and report more than 7 dB of quadrature squeezing measured from the vacuum output of a below threshold OPO. Two methods of transferring the vacuum squeezing onto a bright beam using the squeezed vacuum system are examined. The first method
Lasers and Electro-Optics Europe Conference on and European Quantum Electronics Conference, 2009
In this paper, simple demonstration was presented to produce and measure entanglement, all within... more In this paper, simple demonstration was presented to produce and measure entanglement, all within a single beam. Accessing and manipulating the expanded basis of transverse spatial modes makes this technology an interesting contender for optical quantum protocols.
Publisher Summary This chapter presents an experimental search for squeezing via four-wave mixing... more Publisher Summary This chapter presents an experimental search for squeezing via four-wave mixing in barium. The generation of squeezed light relies on the establishment of a suitable correlation between the fluctuations of two modes of a light field. This can be done by propagating both modes through a nonlinear medium. Four-wave mixing in an atomic medium is one of the nonlinearities that can be used to generate a non-classical, squeezed state of light. This chapter reports the experiments in barium using the lS- 1P transition in 138Ba. This two-level system might provide a stronger and easily describable nonlinearity than the already successful case of sodium, which is complicated by optical pumping. An apparent maximum in the magnitude of four-wave mixing is observed regarding the atomic density, detuning from atomic resonance and laser pump intensity, which would result in a suppression of the quantum noise of only 5% below the standard quantum limit.
A novel application of spectral line interferometry, giving spatial and temporal resolution of an... more A novel application of spectral line interferometry, giving spatial and temporal resolution of an atomic level population for a single event, is presented. Automated and accurate analysis of the interferogram is demonstrated using a fringe pattern analysis based on a two-dimensional Fourier transform. A measurement of an atomic level population in a laser produced barium plasma is used to illustrate these techniques.
Uploads
Papers by H.-a. Bachor