Quantum Computing Asked by Marion on July 29, 2021
I struggle to find any information on Nielsen and Chuang or similar texts on the exact definition of the so-called IQ plane (I think this is a notion closely related to solid state quantum computers such as transmon).
Can you provide a simple explanation of what the IQ plane or recommend some references that clearly explain it and its relation to the estimation of quantum states when one performs quantum state tomography?
IQ is an abbreviation for In-phase and Quadrature phase components of the signal. Whenever a qubit state ie. Z observable is read using a system such as resonator, the phase and amplitude of the resonator at a given frequency of signal changes depending on the qubits state. This change hence creates a change in the IQ plane. Using this measurement technique, quantum tomographies are performed.
Answered by Karthik S on July 29, 2021
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