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A new idea is put forward by Chinese scientists: a quantum loop of a semiconductor quantum loop is constructed for a quantum computer

via:CnBeta     time:2018/1/5 13:42:15     readed:510

Chinese scientists recently jointly published a paper on the latest quantum computing research

Quantum computer is through the superposition and entanglement of quantum phenomena to achieve the growth of computational force. Quantum entanglement enables quantum bits to have both 0 and 1 values ​​for "simultaneous computation." Quantum entanglement allows two quantum bits in two places to share quantum states, creating a super-additive effect: for every additional quantum bit, Operational performance doubled. In theory, a quantum computer with 60 qubits can achieve hundreds of billions of calculations (Class E) in no time.

Mysterious quantum world

The huge potential of quantum computing makes it one of the hottest research projects. All countries in Japan, the United States, Japan and Europe are integrating research forces and resources in various fields to conduct coordinated research. Google,Microsoft

The implementation of quantum bits as an information carrier is a key technology in quantum computer research. Excellent implementations of quantum bits generally require several specific requirements to be met, such as easier physical implementation of the vector, easier initial preparation and manipulation, longer coherence times, and the like.

At present, the realization methods of quantum bits mainly include photons, ion traps, superconducting rings, and quantum structures of semiconductors. Quantum computers based on these different physical carriers each have advantages and disadvantages, such as photon coherence time is long but difficult to observe and control, The guide ring is easy to control but has a very short coherence time. Ion traps, though coherent for a long time and easy to control, are inefficient due to the need for frequent laser operation.

The Chinese Academy of Sciences Institute of Microelectronics Key Laboratory of Microelectronic Devices and Integrated Technology, Chongqing University of Posts and Telecommunications School of Physics, Xiamen University, Institute of Physics and Semiconductor Photonics Research Center, the wave of the group's researchers from the theoretical semiconductor quantum The idea of ​​the ring is to use electron spin-orbit coupling control in a semiconductor quantum multi-electron ring to effectively control the quantum state by means of an external field or electron number and to be easily detected by optical means. More importantly, the realization mechanism based on the semiconductor quantum structure can utilize the existing semiconductor technology, so that the transition from the classical semiconductor chip to the quantum chip can be smoothed.

The research methods in this thesis use a more rigorous and accurate theoretical simulation method, but the computational cost is huge. For example, the physical calculation of the three electronic states requires about 30 billion double-precision floating-point calculations and the calculations of six electronic states But also increase 100 to 1000 times, so the realization of the simulation code from the very beginning to consider a large-scale parallel expansion and optimization, can achieve the simulation of a dozen electronic states.

Original article: http://pubs.rsc.org/en/content/articlelanding/2017/cp/c7cp05675c#! divAbstract

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