The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The complete waveforms of 1.4 mus optical signal pulses are delayed and stored using a coherently prepared warm Rb vapor, and then recovered up to 500 mus later (with a factor of 2 temporal pulse broadening). Mediated by four-wave mixing, frequency-shifted idler pulses are generated, and then stored and retrieved simultaneously with the signal pulses. The intensities of the retrieved pulses depend...
We show that non-degenerate 4-wave mixing in an atomic vapor can produce highly multimode twin beams. The process can be used to generate arbitrarily-shaped continuous-variable entangled twin beams that contain quantum-correlations in time and space.
We have demonstrated guiding of rubidium atom through a hollow core photonic bandgap fiber. Rb atoms from a thermal oven travel down 6 cm fiber with an efficiency that is greater than 70%.
The present status of rubidium atom frequency standard is introduced. The temperature coefficient of traditional Rb clock was mainly made from pump system and variode phase modulation circuit. After filling absorb cell with buffer gas of positive temperature coefficient and adjusting pumping light intensity properly, the temperature coefficient from pump system may be extremely less than that of rubidium...
Rubidium 87 atoms are trapped in an Ioffe-Pritchard potential generated with a persistent supercurrent that flows in a loop circuit patterned on a sapphire surface. To control the supercurrent on a surface, an on-chip thermal switch operated by a focused argon-ion laser is developed.
An experimental sample trace of a trapping event is presented 85Rb atoms have been launched from an atomic fountain along the y-direction. Arming the trigger at 210 ms after launch selects atoms with velocities <0.1 m/s. Because the probe field is resonant with the empty cavity, single atoms cause a steep decrease in the transmission (3). The storage times (A-B) are of the order of a few 10 ms...
This paper report the observation of electromagnetically induced transparency (EIT) in Rb-filled HC-PCF. We observe EIT in a lambda energy-level configuration with narrow linewidth, in contrast to that obtained by Ghosh et al. (2006). The fibre used in this experiment is large-pitch kagome-structured HC-PCF (Couny et al., 2006), with a core diameter of 11 mum. In order to prevent rubidium from being...
Spin squeezed states can be used to improve the performance of atomic clocks and magnetometers. Recently, atom-light interaction of a similar type has also been used to demonstrate quantum memory and quantum teleportation between light and matter. Furthermore, this interaction facilitates studies in the field of controlled quantum dynamics.
This work presents the results of the numerical calculations of (blackbody radiation) BBR-induced photoionization rates of Rb and Na Rydberg nS, nP and nD atoms with n = 8-65 at the ambient temperatures of 77, 300 and 600 K.
There is great interest in photonic crystal fibers (PCFs) because of their potential for hosting highly nonlinear material. Already with material of low nonlinearity such as silica for solid core PCFs, the nonlinear properties can be utilized since high intensities of light are guided within the core. To create squeezed states, we plan to exploit the high nonlinearity of resonant Rb vapor filled in...
Electromagnetically induced transparency allows for light transmission through dense atomic media by means of quantum interference of absorption amplitudes. Media exhibiting electromagnetically induced transparency have interesting properties, such as very slow group velocities. Associated with the slow light propagation are quasiparticles, so-called dark polaritons, which are mixtures of a photonic...
In the present paper we used single mode laser diode working near 960 nm to excite Rb atoms into Rydberg states. Using external cavity described above we have obtained stable continuous operation of the frequency doubling of semiconductor laser with linewidth below 10 MHz and output power of several mW.
In this experiment we use periodically poled potassium titanyl phosphate (PPKTP) as the nonlinear crystal in an optical parametric oscillator (OPO) for the generation of squeezed light on the D1 line of rubidium which lies at 795 nm. Although OPOs have long been used as sources of squeezed light, the shorter wavelengths required for atomic interactions have always been a challenge due to a limited...
Nonlinear Faraday rotation (NFR) was studied for 87Rb atomic D2 Fg = 2-Ft =1,2,3 transitions with crossed polarizers, with varying longitudinal magnetic field strength S = 0-10 G. The experiment was realized in counter-propagating beam Doppler-free geometry.
The authors presented investigations on the application of CPT effect as alternative to the traditional optical microwave double resonance in small atomic clocks. An important factor which may limit the performances of CPT-based atomic clocks is the reduced signal contrast as compared to optical pumping. To overcome this limit, several excitation schemes have been proposed in the last years. Particularly,...
The authors propose and demonstrate an atomic qubit based on a cold rubidium isotopic mixture, entangled with a frequency-encoded optical qubit. We discuss the use of such matter qubits in memory-insensitive multiplexed quantum repeaters.
In conclusion, we have developed a new laser system to laser cool rubidium atoms based on frequency doubling of a 1560 nm fiber bench. The use of telecom components gives us a reliable and compact system robust compare to environmental perturbations. Our laser system should find applications for onboard cold atoms experiments like inertial captors or atomic clocks. For example, our laser could be...
In this paper, we present the first experimental demonstration of the remote preparation of an internal state of a single 87Rb atom. Our approach uses atom-photon entanglement as the interface between the two quantum systems and allows to distantly prepare an arbitrary quantum state of a distant atomic qubit. For this purpose we use the quantum teleportation protocol, where the desired state is first...
Coherent control of tunneling between potential wells by strong driving has been investigated extensively. In our experiment we created Bose-Einstein condensates of rubidium atoms in an crossed dipole trap.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.