Cloning transformations in spin networks without external control

Optimal quantum cloning via spin networks

Qing Chen1,∗ Jianhua Cheng, Ke-Lin Wang, and Jiangfeng Du1,2,3† Department of Modern Physics, University of Science and Technology of China, Hefei 230026, PR China Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, PR China Department of Physics, National University of Singapore, 2 S...

Spin echo without an external permanent magnetic field

We suggest a sequence of instantaneous spin rotations, that reverses the time evolution of a spin subject to an arbitrary built-in magnetic field. The sequence does not require the knowledge of the direction or strength of the built-in field, and is applicable as long as that field is constant in time. The advantage of the suggested sequence compared to the known spin-echo sequences is that it ...

Entanglement in the XZ spin chain model in the external magnetic field

The entanglement at zero-temperature is studied in a two-qubit XZ spin-1/2 chain model in anexternal magnetic field which is applied in the z direction. We have obtained an analytical relation forthe effect of the external magnetic field on the concurrence. It is shown that the ground state of thesystem depends on the strength of exchange coupling. We have shown that the analytical relation oft...

Chemical Risk without Concurrent External Exposure!

Cloning of transfected cells without cloning rings.

was mutagenized by ethyl methanesulfate (EMS) according to Rose et al. (3) and plated to a density of 800 colonies/plate at 23°C for screening temperature-sensitive mutants. After 3 days, the colonies were replica-plated and grown at 23°C and 36°C. The temperature-sensitive strains were selected after 3 days by comparing the two plates according to the following procedure, which combines classi...