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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...
Though they are discrete particles, water molecules flow collectively as liquids, producing streams, waves, whirlpools, and other classic fluid phenomena.
Not so with electricity. While an electric c...
Practical and Fast Quantum Random Number Generation Based on Photon Arrival Time Relative to External Reference
Practical Fast Quantum Random Number Generation Photon Arrival Time Relative External Reference
2016/1/22
We present a practical high-speed quantum random number generator, where the timing of single-photon detection relative to an external time reference is measured as the raw data. The bias of the raw d...
Time Reversal and Charge Conjugation in an Embedding Quantum Simulator
Charge Conjugation Embedding Quantum Simulator
2016/1/22
A quantum simulator is an important device that may soon outperform current classical computations. A basic arithmetic operation, the complex conjugate, however, is considered to be impossible to be i...
日前，在日本奈良举行的第19届IEEE Real-time学术会议上，来自近代物理系物理电子学2012级博士生祁宾祥提交的论文《A Compact PCI-based Measurement and Control System for Satellite-Ground Quantum Communication》经会议专家组评审，被评为4篇获奖学生论文（Student Paper Award）中...
An alternative approach to exact wave functions for time-dependent coupled oscillator model of charged particle in variable magnetic field
time-dependent coupled oscillator model charged particle variable magnetic field
2010/11/4
A general treatment of the quantal time-dependent coupled oscillators in presence of the variable magnetic field is presented. The treatment is based on the use of an alternative canonical transforma...
Time-dependent coupled oscillator model for charged particle motion in the presence of a time varyingmagnetic field
charged particle motion unitary transformation
2010/11/4
The dynamics of time-dependent coupled oscillator model for the charged particle motion subjected to a time-dependent external magnetic field is investigated. We used canonical transformation approach...
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...
Determination of event start time at BESⅢ
event start time time-of-flight drift-chamber track reconstruction
2009/8/14
The principle of the method for the BESⅢ event start time determination and the code construction are described. The investigation of influence of the noise, the method of rejecting noise and the per...
24 January 2007，While physicists have exploited the thermal properties of magnetic nuclei to reach temperatures as low as 100 pK, these techniques are not suitable for cooling relatively large structu...