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QCage – MICROWAVE CAVITY SAMPLE HOLDER

FOR HIGH-FIDELITY QUBIT MEASUREMENTS

QCage is a sample holder system for microwave resonator-based quantum devices such as superconducting quantum processors.

QCage is a sample holder system for microwave resonator based quantum devices such as superconducting quantum processors.

The first released product QCage.24 features the chip suspended in an all-surrounding cavity with 24 coplanar transmission lines ending in bond pads to transmit control and read-out signals up to 18 GHz. By careful design and microwave simulation, we have ensured high-fidelity qubit operation by minimizing losses and decoherence. Our benchmarking data confirms both low-loss transmission and all resonances occurring above 18 GHz.

What are the highlights?

  • Sample chip fully suspended in cavity to minimize losses and decoherence.
  • Low loss PCB with 24 embedded coplanar transmission lines.
  • Cavity and PCB optimized to ensure resonance free transmission up to 18 GHz.
  • EMC tight superconducting shielding enclosure.
  • Flux biasing magnet mounted inside the shielding with filtered feed-throughs.

QCage.24 has been in beta-test for several months at some of the world’s leading superconducting qubit labs. With their best-in-class chips, qubit performance has been demonstrated with Q factors well above 500,000 and qubit dephasing times in excess of 200 microseconds.

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