Erbium atoms in silicon: A primecandidate for quantum networks PhysRevX
Spectroscopy of erbium-implanted silicon waveguides. Inset: experimental setup. A laser is switched by acousto-optic and phase-modulated by electro-optic modulators . A 99∶1 beam splitter is used to guide the light emitted from the sample in the cryostat to single-photon detectors . Main graph: scanning the excitation laser frequency results in several narrow fluorescence peaks, here shown for the FZ sample.
The filled triangles in and mark the filter and excitation laser positions, respectively, in and .Inhomogeneous linewidth and optical lifetime. Resonant fluorescence after excitation laser pulses of different frequency. The observed lines are well fit by Lorentzian curves. The observed linewidths in the FZ samples are larger than in the CZ and CVD samples because of implantation-induced damage. To determine the lifetime, we excite a higher CF level and observe the filtered lowest CF transition.
South Africa Latest News, South Africa Headlines
Similar News:You can also read news stories similar to this one that we have collected from other news sources.
Kari Lake's chances of winning Arizona governor race, according to pollsMost polls are giving Lake a narrow lead, but the race remains neck-and-neck with just one day to go until the midterms.
Read more »
Board Rejects Elissa Silverman's Campaign Finance Ruling AppealThe D.C. elections board handed At-Large Councilmember Elissa Silverman a defeat when it ruled against her procedural appeal of a campaign finance sanction.
Read more »
A powerful (and likely young) radio-loud quasar at z=5.3We present the discovery of PSO J191.05696$+$86.43172 (hereafter PSO J191$+$86), a new powerful radio-loud quasar (QSO) in the early Universe (z= 5.32). We discovered it by cross-matching the NRAO VLA Sky Survey (NVSS) radio catalog at 1.4 GHz with the first data release of the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS PS1) in the optical. With a NVSS flux density of 74.2 mJy, PSO J191$+$86 is one of the brightest radio QSO discovered at z$\sim$5. The intensity of its radio emission is also confirmed by the very high value of radio loudness (R|300). The observed radio spectrum of PSO J191$+$86 shows a possible turnover around $\sim$1 GHz (i.e., $\sim$6 GHz in the rest frame), making it a Gigahertz-Peaked Spectrum (GPS) source. However, variability could affect the real shape of the radio spectrum, since the data in hand have been taken $\sim$25 years apart. By assuming a peak of the observed radio spectrum between 1 and 2 GHz (i.e. $\sim$ 6 and 13 GHz in the rest-frame) we found a linear size of the source of $\sim$10-30 pc and a corresponding kinetic age of 150-460 yr. This would make PSO J191$+$86 a newly born radio source. However, the large X-ray luminosity (5.3$\times$10$^{45}$ erg s$^{-1}$), the flat X-ray photon index ($Γ_X$=1.32) and the optical-X-ray spectral index ($\tilde{α_{ox}}$=1.329) are typical of blazars. This could indicate that the non-thermal emission of PSO J191$+$86 is Doppler boosted. Further radio observations (both on arcsec and parsec scales) are necessary to better investigate the nature of this powerful radio QSO.
Read more »
Silicon Valley Business Journal seeks nominations for Power 100 list - Silicon Valley Business JournalEarly next year, the Journal will be unveiling the Power 100, a list of Silicon Valley's 100 most important and influential people. We need your help finding them.
Read more »
Embedding veterans into your workforce is mission criticalApproximately 200,000 men and women transition out of the United States military every...
Read more »
Why to begin succession plan when business is goodBy implementing an exit strategy, you are setting yourself up for a successful transition to retirement.
Read more »