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      Magnetic imaging of superconducting qubit devices with scanning SQUID-on-tip

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          Abstract

          We use a scanning superconducting quantum interference device (SQUID) to image the magnetic flux produced by a superconducting device designed for quantum computing. The nanometer-scale SQUID-on-tip probe reveals the flow of superconducting current through the circuit as well as the locations of trapped magnetic flux. In particular, maps of current flowing out of a flux-control line in the vicinity of a qubit show how these elements are coupled, providing insight on how to optimize qubit control.

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          Quantum supremacy using a programmable superconducting processor

          Frank Arute, Kunal Arya, Ryan Babbush … (2019)
          Article 0 comments Cited 1027 times – based on 0 reviews     Review now
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            Towards understanding two-level-systems in amorphous solids: insights from quantum circuits

            Clemens Müller, Jared Cole, Jürgen Lisenfeld (2019)
            Article 0 comments Cited 83 times – based on 0 reviews     Review now
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              A scanning superconducting quantum interference device with single electron spin sensitivity

              Denis Vasyukov, Yonathan Anahory, Lior Embon … (2013)
              Superconducting quantum interference devices (SQUIDs) can be used to detect weak magnetic fields and have traditionally been the most sensitive magnetometers available. However, because of their relatively large effective size (on the order of 1 µm), the devices have so far been unable to achieve the level of sensitivity required to detect the field generated by the spin magnetic moment (μB) of a single electron. Here we show that nanoscale SQUIDs with diameters as small as 46 nm can be fabricated on the apex of a sharp tip. The nano-SQUIDs have an extremely low flux noise of 50 nΦ0 Hz(-1/2) and a spin sensitivity of down to 0.38 μB Hz(-1/2), which is almost two orders of magnitude better than previous devices. They can also operate over a wide range of magnetic fields, providing a sensitivity of 0.6 μB Hz(-1/2) at 1 T. The unique geometry of our nano-SQUIDs makes them well suited to scanning probe microscopy, and we use the devices to image vortices in a type II superconductor, spaced 120 nm apart, and to record magnetic fields due to alternating currents down to 50 nT.
              Article 0 comments Cited 77 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Journal
                Title: Applied Physics Letters
                Publisher: AIP Publishing
                ISSN (Print): 0003-6951
                ISSN (Electronic): 1077-3118
                Publication date Created: August 01 2022
                Publication date Created: August 01 2022
                Publication date (Print): August 01 2022
                Publication date (Electronic): August 03 2022
                Publication date Other: August 01 2022
                Volume: 121
                Issue: 5
                Article
                DOI: 10.1063/5.0103597
                SO-VID: 63983ac4-1277-4ad3-8e5b-88e8fbdddb06
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