Low-temperature microwave source, low-temperature microwave source chip and manufacture method thereof

Abstract

The invention discloses a low-temperature microwave source, a low-temperature microwave source chip and a manufacture method thereof. The chip comprises a substrate, a transmission cavity, a bias junction, a voltage bias line and a direct current bias line, wherein the transmission cavity, the bias junction, the voltage bias line and the direct current bias line are located on the surface of the substrate. The transmission cavity comprises a SQUID chain and is used for emitting microwave photons. The bias junction is electrically connected with the transmission cavity and is used for generating microwave photons. The voltage bias line is used for applying bias voltage to the bias junction, so that electronic cooper pairs in the bias junction are transformed into microwave photons through stimulated emission. The direct current bias line is used for applying a magnetic field to the transmission cavity. The resonant frequency of the transmission cavity is determined by the total capacitance and total inductance of the SQUID chain. The total inductance of the SQUID chain varies with the size of the magnetic field. The size of the magnetic field varies with the magnitude of the current in the direct current bias line. According to the invention, the low-temperature microwave source chip generates microwave photons through stimulated emission; the stability of the frequency, the amplitude and the phase of emitted microwave photons is ensured; and microwave source requirements are met.

Description

technical field [0001] The invention relates to microwave circuit components, more specifically, to a low-temperature microwave source, a low-temperature microwave source chip and a manufacturing method thereof. Background technique [0002] In the field of solid-state quantum computing, only by placing the quantum chip in an extremely low temperature environment can the quantum characteristics of the qubit be fully highlighted, and it is also necessary to suppress the influence of environmental noise on quantum coherence. However, in the prior art, the measurement techniques used to control qubits are all performed by classical instruments. For example, the microwave source used to control qubits is difficult to meet the current needs of solid-state quantum chip control and quantum computing. [0003] In the prior art, the microwave source used to manipulate qubits has the problem of high noise on the one hand, and on the other hand, because the microwave source is applied ...

AI Technical Summary

Problems solved by technology

However, in the prior art, the measurement techniques used to control qubits are all performed by classical instruments. For example, the microwave source used to control qubits is difficult to meet the current needs of solid-state quantum chip control and quantum computing.

[0003] In the prior art, the microwave source used to manipulate qubits has the problem of high noise on the one hand, and on the other hand, because the microwave source is applied through the room temperature line, before the microwave signal goes from room temperature to the ultra-low temperature quantum chip, it needs to be processed. Complex filtering, attenuation and other optimization design, but often the optimized microwave signal still cannot meet the requirements of solid-state quantum chip control and quantum computing

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