Tuning in to noisy interference

Establishing a detailed knowledge of the noise properties of superconducting systems is an important step towards the development of quantum computers, which will enable new types of computing. However, the signals of these systems’ tiny electronic components, such as transistors on a chip, are so small that ambient noise creates interference. This problem is compounded by the delicate nature of the technology’s quantum physical states, which are also susceptible to noise. Now, an international research team has successfully measured the noise spectrum of a superconducting circuit—called a superconducting flux qubit—that is widely investigated for its potential in quantum computing applications.

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