Quantum computer is called "the 21st century space race", is an epoch-making scientific revolution. Quantum computers have powerful computational power to solve difficult or unmanageable problems of traditional computers, such as the design of complex drugs and advanced materials, large-scale database search and so on.
At present, the biggest challenge of quantum computers is how to retain their quantum states superposition for the most as long as it helps to retain longer quantum information, which helps to develop more reliable super quantum computers.
On October 17, Nature Nanotechnology published a related online paper on the new qubits (also called qubits) recently developed by the University of New South Wales, Australia (UNSW).
Andrew Moreiro, project manager at the UNSW Center for Quantum Computing and Communications Technology, led the research that uses the single-electron spin-state of silicon atoms placed under high-frequency oscillating electromagnetic fields to obtain the longest and most stable Quantum state superposition, the de-phase time T2Ï * = 2.4 milliseconds, the stability obtained a 10-fold increase.
Quantum computer super computing speed and ability to rely mainly on its original state can simultaneously store a variety of quantum state superposition, n-bit quantum memory storage capacity is 2n times the traditional computer. It is based on quantum state superposition principle, quantum computer with huge data storage capacity, and thus be able to carry out highly efficient parallel computing.
SEM (Scanning Electron Microscopy) red for the qubit device represents the various "FM gates," blue for the "microwave antenna," and yellow for the "single electron transistor" for reading spin-state information.
For more than ten years, the Morello team has been studying for a long time, and now it has been able to encode the quantum information by using the electron spin state of a single phosphorus atom in a silicon magnetic field in a static magnetic field, and establishes the longest quantum state superposition retention time Solid state device qubits.
This time, the team further improved the stability of the qubit and proposed a new quantum information coding method. The new qubit is composed of the spin state of a single silicon atom, which is in a high-intensity electromagnetic field oscillating constantly at microwave frequencies . Quantum bits are also redefined when the electrons are coupled to an applied magnetic field - the two states of the qubit are no longer simply the spin directions of the electrons, but "symmetrical" and "asymmetric" relative to the coupled magnetic field.
The result is astonishing: Since the electromagnetic field generated by the microwave continues to oscillate at high frequencies, the final net effect of any non-same-frequency noise or disturbance is zero, resulting in a 10-fold increase in the total overlap of the last available quantum states! Specifically, the experimentally obtained decoherence time of T2Ï * = 2.4 ms, which is 10 times better than the performance of a standard qubit, allows the quantum states to be additively held for a longer period of time, allowing for more computational operations.
Arna Rauchter, a research fellow at the UNSW School of Electrical Engineering and Communications, said: "The new qubits enable the coupling of a single electron's spin-field to high-frequency oscillating electromagnetic fields. The coupled qubit, The electron spin, gaining more versatile and more stable functions, will help develop a more reliable quantum computer. "
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