The NQCC will have a presence at this year’s American Physical Society’s (APS) Global Physics Summit in Denver, Colorado.
About the Event
The APS Global Physics Summit is the largest physics research conference in the world, uniting 14,000 scientific community members across all disciplines of physics. This meeting reflects the inclusivity and synergy of many physics disciplines and emerging cross-disciplinary areas of science, which perfectly reflects this year’s theme of Science for a Shared Future.
NQCC Speakers
Speaker
Aneirin Baker
Hardware Engineer
Monday, 16/03/2026, 16:30 – 16:42 (GMT-6)
MAR-C14- Superconducting Qubits: Parametric and Multi-qubit Gates
Towards Multi Qubit Parity Gates in Superconducting Qubits
As Quantum computers move closer to requiring error correction the need to optimize the underlying parity checks that drive Quantum Error Correction becomes ever clearer. Parity checks on well-known codes such as the surface code require multiple CNOT gates each on different qubits. Reducing the number of two qubit gates for these parity checks would reduce the overall operation time for surface code rounds and reduce the error rate of systems with multiple parity checks in.
The Tunable coupler architecture has emerged as the most promising architecture or superconducting quantum computers, within the architecture it’s possible to engineer large enough ZZ interactions which can perform multi qubit parity checks in a single shot measurement. Here we report on progress made towards the measurement of multi qubit parity checks within a system with tunable couplers. Within this project we aim to perform and benchmark these gates, testing their performance and comparing them to the standard multi CNOT gate decomposition.
Speaker
Javier Navarro Montilla
Superconducting Qubit Physicist
Tuesday, 17/03/2026, 17:30 – 17:42 (GMT-6)
(MAR-J05) Traveling Wave Parametric Amplifiers (TWPAs)
Single-shot qubit state readout using JTWPA idler mode: experiments and applications
Josephson Travelling Wave Parametric Amplifiers (JTWPAs) are essential components in superconducting qubit readout chains, providing broadband gain and quantum-limited noise performance. When a weak signal co-propagates with a strong pump through the nonlinear medium formed by Josephson junctions, wave mixing transfers energy from the pump to the signal and generates an idler tone. The idler frequency is fixed by energy and momentum conservation, and because it is intrinsically correlated with the signal, it carries equivalent information about the qubit state.
We demonstrate high-fidelity dispersive readout of superconducting qubits using the idler tone from a JTWPA, implemented with commercially available arbitrary waveform generators. Our setup allows simultaneous measurement of the signal and idler outputs, enabling direct investigation of their correlations. By controlling the relative phase between pump and signal, we observe signatures of two-mode phase-sensitive amplification. We discuss potential applications of this dual-tone readout scheme, including intrinsic reverse isolation and new pathways toward scalable quantum computing architectures.