What is measured when a qubit measurement is performed on a multi-qubit chip?
arXiv:2001.11756 · doi:10.1103/PhysRevA.102.032623
Abstract
We study how single-qubit dispersive readout works alongside two qubit coupling. To make calculations analytically tractable, we use a simplified model which retains core characteristics of but is discretised compared to dispersive homodyne detection. We show how measurement speed and power determine what information about the qubit(s) is accessed. Specifically we find the basis the measurement is closest to projecting onto. Compared to the basis gates are applied in, this measurement basis is modified by the presence of photons in the readout resonator.
arXiv comment4 figures, v2: added some discussion, close to published version
References in corpus (13)
- Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
- Quantum information processing with superconducting circuits: a review
- Building logical qubits in a superconducting quantum computing system
- Realizing Rapid, High-Fidelity, Single-Shot Dispersive Readout of Superconducting Qubits
- Rapid high-fidelity multiplexed readout of superconducting qubits
- Effective Hamiltonian models of the cross-resonance gate
- Protocols for optimal readout of qubits using a continuous quantum nondemolition measurement
- Selective darkening of degenerate transitions demonstrated with two superconducting quantum bits
- Resonator/zero-Qubit architecture for superconducting qubits
- Stabilizer quantum error correction toolbox for superconducting qubits
- Weak and strong measurement of a qubit using a switching-based detector
- The information about the state of a qubit gained by a weakly coupled detector
- Qubit measurement error from coupling with a detuned neighbor in circuit QED
Cited by in corpus (4)
- Transmon platform for quantum computing challenged by chaotic fluctuations
- A randomized benchmarking suite for mid-circuit measurements
- SuperGrad: a differentiable simulator for superconducting processors
- Exploring the Fidelity of Flux Qubit Measurement in Different Bases via the Quantum Flux Parametron