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Physicists harness quantum “time reversal” to measure vibrating atoms（图）
量子 时间反转 振动原子 原子钟 量子传感器
2023/6/9
The quantum vibrations in atoms hold a miniature world of information. If scientists can accurately measure these atomic oscillations, and how they evolve over time, they can hone the precision of ato...
MIT physicists have discovered a new quantum bit, or “qubit,” in the form of vibrating pairs of atoms known as fermions. They found that when pairs of fermions are chilled and trapped in an optical la...
Quantum limited measurement of magnetic field gradient with entangled atoms
Quantum limited measurement magnetic field gradient entangled atoms
2016/1/23
We propose a method to detect the amplitude gradient of a microwave field by using a pair of entangled two-component Bose-Einstein condensates. We consider the two spatially separated condensates to b...
Direct Probe of Topological Order for Cold Atoms.
Direct Probe Topological Order Cold Atoms
2016/1/22
Cold-atom experiments in optical lattices offer a versatile platform to realize various topological quantum phases. A key challenge in those experiments is to unambiguously probe the topological order...
Variational Calculation of Low-energy Positron Life Time in Xe Atoms
Positron Annihilation Bound wavefunction Scattered wavefunction Variational Method
2010/6/30
The least-squares variational method (LSVM) is used for determining trial wavefunctions representing lowenergy positron-xenon elastic scattering, which are used to determine the positron lifetime. The...
Study of the background in the experiments of inner-shell ionization of atoms by positron impact
positron atomic ionization by positron impact Monte Carlo simulation
2009/8/14
One of main difficulties in the experiments of inner-shell ionization of atoms by positron impact near threshold energy region is the relatively high low-energy background, which is caused by the depo...