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JILA’s 3-D Quantum Gas Atomic Clock Offers New Dimensions in Measurement（图）
JILA 3-D Quantum Gas Atomic Clock New Dimensions Measurement
2017/10/25
JILA physicists have created an entirely new design for an atomic clock, in which strontium atoms are packed into a tiny three-dimensional (3-D) cube at 1,000 times the density of previous one-dimensi...
Locking Local Oscillator Phase to the Atomic Phase via Weak Measurement
Locking Local Oscillator Atomic Phase Weak Measurement
2011/8/11
Abstract: We propose a new method to reduce the frequency noise of a Local Oscillator (LO) to the level of white phase noise by maintaining (not destroying by projective measurement) the coherence of ...
Remote frequency measurement of the 1S0-3P1 transition in laser cooled 24Mg
Remote frequency measurement 1S0-3P1 transition laser cooled 24Mg Quantum Gases
2011/8/4
Abstract: We perform Ramsey-Borde spectroscopy on laser cooled magnesium atoms in free fall to measure the 1S0-3P1 intercombination transition frequency. The measured value of 655 659 923 839 730 (48)...
Improved Measurement of the Hydrogen 1S - 2S Transition Frequency
Hydrogen 1S - 2S Transition Frequency atomic hydrogen photon spectroscopy
2011/8/4
Abstract: We have measured the 1S - 2S transition frequency in atomic hydrogen via two photon spectroscopy on a 5.8 K atomic beam. We obtain $f_{1S-2S} = 2 466 061 413 187 035 (10)$ Hz for the hyperfi...
Differential energy measurement between He- and Li-like uranium intra-shell transitions
energy measurement He- and Li-like uranium intra-shell transitions
2011/9/5
We present the first clear identification and highly accurate measurement of the intra-shell transition 1s2p 3P2 ! 1s2s 3S1 of He-like uranium performed via X-ray spectroscopy.The present experiment h...
Three-Axis Measurement and Cancellation of Background Magnetic Fields to less than 50uG in a Cold Atom Experiment
Three-Axis Measurement a Cold Atom Experiment
2011/8/29
Many experiments involving cold and ultracold atomic gases require very precise control of magnetic elds that couple to and drive the atomic spins. Examples range from quantum transport,entanglement ...
Measurement of the W boson helicity in top quark decays using 5.4 fb^-1 of ppbar collision data
W boson helicity top quark decays 5.4 fb^-1 of ppbar collision data
2011/1/5
We present a measurement of the helicity of the W boson produced in top quark decays using
t¯t decays in the ℓ+jets and dilepton final states selected from a sample of 5.4 fb−1 of co...
Measurement-induced quantum entanglement recovery
Measurement-induced quantum entanglement recovery
2010/11/4
By using photon pairs created in parametric down conversion, we report on an experiment, which demonstrates that measurement can recover the quantum entanglement of two qubit system in a pure dephasi...
Measurement of the Top Pair Production Cross Section in the Dilepton Decay Channel in ppbar Collisions at sqrt s = 1.96 TeV
Top Pair Production CDF II Detector
2010/3/15
A measurement of the $\ttbar$ production cross section in $\ppbar$ collisions at $\sqrt{{\rm s}}$ = 1.96 TeV using events with two leptons, missing transverse energy, and jets is reported. The data we...
Partial wave analysis of J/ψ→ppπ0 and measurement of J/ψ→ppη, ppη´
J/ψ Decays PWA Excited Baryon states N(2065)
2009/11/24
Based on 58 million J/ψ data collected with the BESⅡ detector at the BEPC, Partial Wave Analysis(PWA) is performed on J/ψ→ppπ0. The new excited baryon N(2065) is confirmed. Clear signals for other N*...