Diagnostic device

A diagnostic apparatus comprising:

• an array of superconducting quantum interference devices (SQUIDs) configured to be positioned over an array of test circuits, wherein each SQUID of the array of SQUIDs is configured to be coupled to a respective test circuit of the array of test circuits such that an electronic noise present in the respective test circuit induces a respective first current that flows through each SQUID;
• and
• a current source configured to provide a second current that flows through each SQUID, wherein each SQUID is configured to generate a respective output in a form of:
• a respective first voltage in response to a respective sum of the respective first current and the second current being less than a respective threshold current, and
• a respective second voltage in response to the respective sum of the respective first current and the second current being greater than the respective threshold current.

A diagnostic device comprising:

• a superconducting quantum interference device (SQUID) configured to be coupled to a test circuit such that an electronic noise present in the test circuit induces a first current that flows through the SQUID;
• and
• a current path configured to receive a second current that flows through the SQUID, wherein the SQUID is configured to generate an output in a form of:
• a first voltage in response to a sum of the first current and the second current being less than a threshold current, and
• a second voltage in response to the sum of the first current and the second current being greater than the threshold current.