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[ Instrument network instrument research and development ] With the continuous development of semiconductor quantum computing, the performance of semiconductor qubits has greatly improved, and how to achieve multi-qubit expansion has become an important research hotspot in this field. The use of photons in the microwave cavity as a medium to achieve the interaction between bits is considered to be one of the potential expansion methods, and the first condition of this scheme is to achieve strong coupling between the qubit and the microwave cavity (qubit and microwave cavity The coupling rate is greater than the dissipation rate of bits and photons).
Because traditional spectroscopy methods cannot address the modulation effect caused by photons, and can only characterize and adjust a single bit in turn, it is difficult to characterize the properties of a multi-bit hybrid system and adjust bit parameters.
The research team of the University of Science and Technology of China developed a new type of spectroscopy method and systematically characterized the evolution of the coupling strength between the two semiconductor qubits and the microwave cavity based on the strong coupling of the two semiconductor qubits. Researchers prepared a high-impedance SQUID (superconducting quantum interference device) array resonant cavity in the order of kiloohms, which greatly increased the coupling strength of the semiconductor qubit and the resonant cavity, and realized the strong coupling between two non-neighboring qubits.
On this basis, the research group further developed a new spectrum characterization method. Different from the traditional characterization method, the researchers obtained the two-bit correlation evolution spectrum by changing the working frequency of the two qubits, and found that this evolution spectrum showed a completely different geometric pattern with the minimum working frequency of the bit, and systematically analyzed the characteristics of the pattern with the system. The evolution of parameters.
This method characterizes the hybrid system from a new perspective (parameter space), provides a new type of spectroscopy characterization method that is also applicable in multi-bit situations, and effectively improves the characterization of multi-bit hybrid systems and modulation bit parameters The high efficiency provides a new research idea for studying the interaction of multi-bit systems using photons as the coupling medium.
(Original title: Chinese scientists use new spectral methods to characterize long-range coupled semiconductor qubits)