Microwave calibration of qubit drive line components at millikelvin temperatures
arXiv:2112.05152 · doi:10.1063/5.0081861
Abstract
Systematic errors in qubit state preparation arise due to non-idealities in the qubit control lines such as impedance mismatch. Using a data-based methodology of short-open-load calibration at a temperature of 30 mK, we report calibrated 1-port scattering parameter data of individual qubit drive line components. At 5~GHz, cryogenic return losses of a 20-dB-attenuator, 10-dB-attenuator, a 230-mm-long 0.86-mm silver-plated cupronickel coaxial cable, and a 230-mm-long 0.86-mm NbTi coaxial cable were found to be 35 dB, 33 dB, 34 dB, and 29 dB respectively. For the same frequency, we also extract cryogenic insertion losses of 0.99 dB and 0.02 dB for the coaxial cables. We interpret the results using a master equation simulation of all XY gates performed on a single qubit. For example, we simulate a sequence of two 5 ns gate pulses (X & Y) through a 2-element Fabry-Pérot cavity with 276-mm path length directly preceding the qubit, and establish that the return loss of its reflective elements must be >9.7 dB (> 14.7 dB) to obtain 99.9 % (99.99 %) gate fidelity.
arXiv comment6 pages, 3 figures plus supplementary material (3 figures). The following article has been accepted by Applied Physics Letters. After it is published, it will be found at https://doi.org/10.1063/5.0081861
References in corpus (27)
- QuTiP 2: A Python framework for the dynamics of open quantum systems
- A Quantum Engineer's Guide to Superconducting Qubits
- Leakage reduction in fast superconducting qubit gates via optimal control
- Quantum--Classical Interface Based on Single Flux Quantum Digital Logic
- Microwaves in Quantum Computing
- Distinguishing coherent and thermal photon noise in a circuit QED system
- Improving quantum gate fidelities by using a qubit to measure microwave pulse distortions
- Perspective on traveling wave microwave parametric amplifiers
- Time-domain characterization and correction of on-chip distortion of control pulses in a quantum processor
- Microwave Package Design for Superconducting Quantum Processors
- Measurement of Collective Dynamical Mass of Dirac Fermions in Graphene
- The Quantum Socket: Three-Dimensional Wiring for Extensible Quantum Computing
- In-situ Broadband Cryogenic Calibration for Two-port Superconducting Microwave Resonators
- Understanding the saturation power of Josephson Parametric Amplifiers made from SQUIDs arrays
- Graphene microwave transistors on sapphire substrates
- Zero-field Edge Magnetoplasmons in a Magnetic Topological Insulator
- Characterization of a multimode coplanar waveguide parametric amplifier
- Active protection of a superconducting qubit with an interferometric Josephson isolator
- Characterizing cryogenic amplifiers with a matched temperature-variable noise source
- High Coherence Plane Breaking Packaging for Superconducting Qubits
- Millikelvin thermal and electrical performance of lossy transmission line filters
- In situ characterization of qubit control lines: a qubit as a vector network analyzer
- General purpose multiplexing device for cryogenic microwave systems
- Qubit gates using hyperbolic secant pulses
- Microwave Admittance of Gold-Palladium Nanowires with Proximity-Induced Superconductivity
- Nonlinear Signal Distortion Corrections Through Quantum Sensing
- Accurate Qubit Control with Single Flux Quantum Pulses