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A realization of time-bin entanglement obtained from quantum dots would join the strength of long distance transmission that characterizes this type of entanglement with the single photon state purity of the quantum dot emission. Compared with polarization entanglement from quantum dots this scheme does not require elimination of the fine structure splitting responsible for partial distinguishability...
We demonstrate the coherent creation of a biexciton in an InAs/GaAs quantum dot embedded in a planar microcavity through resonant two-photon excitation. This results in laser scattering-free cascaded single photons with excellent two-photon suppression. We also observe Rabi oscillations, Ramsey interference and high indistinguishability. This scheme can be used to generate entangled photon pairs and...
Entangled photon pairs are an essential tool for various quantum protocols as teleportation [1], entanglement swapping [2], and realisation of quantum gates [3]. The traditional way to produce entangled photon pairs is the spontaneous parametric downconversion [4]. These sources are well developed and reliable. However, the number of photon pairs emitted in downconversion obey the thermal distribution.
Entangled photon pairs are used in several important quantum information applications including quantum networks [1] and quantum computing [2]. Moreover, they are a crucial component for multi-photon experiments like entanglement swapping [3].
The ability to measure magnetic fields with high sensitivity is a key requirement in many physical, biological and medical applications. Currently the most sensitive magnetometers are optical magnetometers, in which the polarization of an atomic sample responds to the field and is read out by an optical measurement. These instruments are limited by two fundamental sources of quantum noise: projection...
We demonstrate a light-shot-noise-limited magnetometer based on the Faraday effect in a hot unpolarized ensemble of rubidium atoms. By using off-resonant, polarization-squeezed probe light, we improve the sensitivity of the magnetometer by 3.2 dB.
We present the quadrature and polarization squeezing generated by a sub-threshold optical parametric oscillator (OPO) resonant to rubidium D1 line and pumped by a frequency-doubled diode laser. We demonstrate here a technique to eliminate the effects of laser phase noise on quadrature squeezing. The technique uses cavity stabilization of the laser frequency, in combination with a carefully chosen...
There has been increasing interest in the generation of such photon pairs using a spontaneous parametric down-conversion (SPDC) source inside an optical cavity to enhance the down-conversion into modes resonant to the cavity, each of the modes having a MHz spectrum. These optical parametric oscillators (OPO) operated far below threshold also provide a well defined spatial mode. Our setup consists...
We use narrow-band quantum light sources, tuned to the rubidium D1 resonance, to produce polarization-squeezed and polarization-NooN states for Heisenberg-limited measurements on atoms. By paramagnetic Faraday rotation these states measure the atomic spin polarization.
We describe an ultra-bright source of narrow-band pairs of indistinguishable photons based on cavity-enhanced down-conversion. This source is suitable for experiments on light-matter interactions at the single-photon level.
In this paper, we present a technically improved source of such rubidium resonant squeezed light. It uses a new pumping laser system and a technologically advanced locking scheme. To produce squeezed light, we use the proven technique of downconversion within a subthreshold OPO but with one distinct difference: our OPO is not pumped by a Ti:Sapphire laser, but by a diode laser system. This system...
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