Physical organization network recently said that scientists at the University of New South Wales (UNSW) in Australia have recently developed a new qubit that has a quantum superposition stability that is 10 times higher than before, helping to develop more reliable silicon-based quantum. computer. Relevant research results are published online in Nature·Nanotechnology. The speed and ability of quantum computers depends on the quantum system's simultaneous processing of multiple quantums stacked together, enabling quantum computers to perform efficient parallel computing and powerful processing capabilities for problems such as searching large databases. Andrew Morero, the research director and project manager of the UNSW Center for Quantum Computing and Communication Technology, said that the biggest challenge of quantum computers is how to preserve the quantum state stack for a long time, which helps to retain quantum information for a longer period of time, thus creating a more reliable Quantum computer. In the past 10 years, the team has been able to encode quantum information in the static magnetic field using the electron spin state of a single phosphorus atom of a silicon chip, and established the solid state device qubit with the longest retention time of quantum state superposition. This time, the first author of the paper, the team of researcher Arna Lauchout of UNSW School of Electrical Engineering and Telecommunications, proposed a new method of encoding quantum information. The new qubits enable the coupling of a single electron spin state with a high frequency oscillating electromagnetic field. Since the electromagnetic field generated by the microwave oscillates stably at a very high frequency, any noise or interference of non-synchronous frequency has no effect. The quantum position of the coupled quantum bit is increased by 10 times compared with the individual electron spin. Morero said that this new type of qubit is called "embellished qubit" and provides more quantum state control methods than "unmodified" "naked qubits." By simply adjusting the frequency of the microwave electromagnetic field, the corresponding quantum state superposition can be controlled, just like an FM radio; on the contrary, the "naked qubit" control method requires adjustment of the control field switch, just like an AM radio. It is worth mentioning that this new qubit is built on standard silicon technology, which lays the foundation for the creation of powerful and reliable quantum processors based on existing manufacturing processes of traditional computers.
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