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Universidad de Salamanca
María Jesús Santos Sánchez
Facultad de Ciencias - Departamento Física Aplicada

Characterization of Quantum Non-demolition Measurements of Superconducting Qubits

Characterization of Quantum Non-demolition Measurements of Superconducting Qubits
Speaker: Tomás Ramos (CSIC QUINFOG Madrid)
Fecha, lugar y hora: 14/06/2024, aula I Edificio del Trilingüe (Facultad de Ciencias, Universidad de Salamanca) 10:00 a 11:00 h
The current generation of quantum machines can perform universal quantum logic operations, but the number of successive operations is limited by noise, imperfections, and decoherence. My work focuses on improving the quality of quantum measurement and amplification in superconducting circuits, which induces the largest errors at the moment (on order 1%). In this seminar, I will first review the standard procedure for dispersive qubit readout and then discuss new tomographic methods to experimentally reconstruct the complete quantum process behind a quantum non-demolition (QND) measurement [1,2]. This provides valuable information to identify measurement errors, and we show how to use this to improve the calibration of dispersive superconducting qubit, quantify more precisely the QNDness and back-action of the measurement, as well as to characterize multi-qubit parity measurements needed in quantum error correcting codes.
Maria Jesus


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