Parallel tomography of quantum non-demolition measurements in multi-qubit devices

• URL: http://arxiv.org/abs/2204.10336v3
• Date: Wed, 7 Jun 2023 10:47:36 GMT
• Title: Parallel tomography of quantum non-demolition measurements in multi-qubit devices
• Authors: L. Pereira, J. J. Garc\'ia-Ripoll, and T. Ramos
• Abstract summary: We introduce a parallel tomography of QND measurements that addresses single- and two-qubit readout on a multi-qubit quantum processor. We show how to quantify measurement cross-talk and use it to certify the quality of simultaneous readout on multiple qubits.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: An efficient characterization of QND measurements is an important ingredient towards certifying and improving the performance and scalability of quantum processors. In this work, we introduce a parallel tomography of QND measurements that addresses single- and two-qubit readout on a multi-qubit quantum processor. We provide an experimental demonstration of the tomographic protocol on a 7-qubit IBM-Q device, characterizing the quality of conventional qubit readout as well as generalized measurements such as parity or measurement-and-reset schemes. Our protocol reconstructs the Choi matrices of the measurement processes, extracts relevant quantifiers -- fidelity, QND-ness, destructiveness -- and identifies sources of errors that limit the performance of the device for repeated QND measurements. We also show how to quantify measurement cross-talk and use it to certify the quality of simultaneous readout on multiple qubits.

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