Flux Qubit Readout in the Persistent Current Basis at arbitrary Bias Points
arXiv:1904.13157 · doi:10.1103/PhysRevA.101.012305
Abstract
Common flux qubit readout schemes are qubit dominated, meaning they measure in the energy eigenbasis of the qubit. For various applications meausrements in a basis different from the energy eigenbasis are required. Here we present an indirect measurement protocol, which is detector dominated instead of qubit dominated, yielding a projective measurements in the persistent current basis for arbitrary bias points. We show that with our setup it is possible to perform a quantum nondemolition measurement (QND) in the persistent current basis at all flux bias points with fidelities reaching almost 100%.
5 pages, 3 figures + 5 pages Supplemental
References in corpus (20)
- Surface codes: Towards practical large-scale quantum computation
- Ultrastrong coupling between light and matter
- Beyond the Jaynes-Cummings model: circuit QED in the ultrastrong coupling regime
- Decoherence of flux qubits due to 1/f flux noise
- Bounds for the adiabatic approximation with applications to quantum computation
- Observation of topological phenomena in a programmable lattice of 1,800 qubits
- Single-shot qubit readout in circuit Quantum Electrodynamics
- Single-shot qubit readout in circuit Quantum Electrodynamics
- Model for l/f Flux Noise in SQUIDs and Qubits
- 1/f Flux Noise in Josephson Phase Qubits
- Two-Qubit State Tomography using a Joint Dispersive Read-Out
- Observation of classical-quantum crossover of 1/f flux noise and its paramagnetic temperature dependence
- Quantum-Limited Measurement and Information in Mesoscopic Detectors
- High-contrast dispersive readout of a superconducting flux qubit using a nonlinear resonator
- Nondestructive readout for a superconducting flux qubit
- Coherent coupled qubits for quantum annealing
- Simulation of Many-Body Hamiltonians using Perturbation Theory with Bounded-Strength Interactions
- Large Dispersive Shift of Cavity Resonance Induced by a Superconducting Flux Qubit in the Straddling Regime
- Non-Gaussian dephasing in flux qubits due to 1/f-noise
- Quantum speedup in stoquastic adiabatic quantum computation