Noise cross-correlations from single-shot measurements

Abstract

We introduce a novel method that we call Single-Shot Cross-Spectroscopy (SSCS), for extracting the auto- and cross-power spectral densities of dephasing noise of a qubit pair. The method uses straightforward input, namely single-shot readouts from single-qubit Ramsey-type experiments, and is resilient against errors in state preparation and measurement. We apply it to experimental data from a semiconductor spin-qubit device and obtain noise spectra over five orders of magnitude in frequency (5 mHz--500 Hz). Compared to other techniques, SSCS enables access to noise correlations in the previously inaccessible intermediate-frequency range (1--500 Hz) for spin qubits, and can be further extended with faster readout. More broadly, the frequency range accessible with SSCS is limited only by the experiment repetition rate, and scales accordingly on other platforms.

10 pages, 4 figures

References in corpus (32)

• Suppressing quantum errors by scaling a surface code logical qubit
• A >99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
• Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
• Quantum error correction below the surface code threshold
• How to Enhance Dephasing Time in Superconducting Qubits
• Decoherence benchmarking of superconducting qubits
• Fault-tolerant quantum computation with long-range correlated noise
• Fault-Tolerant Quantum Computation For Local Non-Markovian Noise
• Rotating-frame relaxation as a noise spectrum analyzer of a superconducting qubit undergoing driven evolution
• Low-frequency spin qubit detuning noise in highly purified ${}^{28}$Si/SiGe
• Charge-noise spectroscopy of Si/SiGe quantum dots via dynamically-decoupled exchange oscillations
• Quantum crosstalk analysis for simultaneous gate operations on superconducting qubits
• Spectroscopy of low-frequency noise and its temperature dependence in a superconducting qubit
• Spectrum of the Nuclear Environment for GaAs Spin Qubits
• Quantum Error Correction in Spatially Correlated Quantum Noise
• Noise-correlation spectrum for a pair of spin qubits in silicon
• Quantum dephasing in a gated GaAs triple quantum dot due to nonergodic noise
• Spectroscopy of cross-correlations of environmental noises with two qubits
• Crosstalk analysis for single-qubit and two-qubit gates in spin qubit arrays
• A silicon singlet-triplet qubit driven by spin-valley coupling
• Improving qubit coherence using closed-loop feedback
• Spatial noise correlations beyond nearest-neighbor in ${}^{28}$Si/SiGe spin qubits
• Coherence of a driven electron spin qubit actively decoupled from quasi-static noise
• Nonlinear response and crosstalk of electrically driven silicon spin qubits
• Spatial Noise Correlations in a Si/SiGe Two-Qubit Device from Bell State Coherences
• Rapid single-shot parity spin readout in a silicon double quantum dot with fidelity exceeding 99 %
• Noise Spectroscopy Using Correlations of Single-Shot Qubit Readout
• Spectroscopy of classical environmental noise with a qubit subjected to projective measurements
• Bayesian estimation of correlation functions
• Inferring charge-noise source locations from correlations in spin qubits
• The origins of noise in the Zeeman splitting of spin qubits in natural-silicon devices
• Efficient Qubit Calibration by Binary-Search Hamiltonian Tracking