Dispersive Qubit Measurement by Interferometry with Parametric Amplifiers
arXiv:1407.3059 · doi:10.1103/PhysRevB.90.134515
Abstract
We perform a detailed analysis of how an amplified interferometer can be used to enhance the quality of a dispersive qubit measurement, such as one performed on a superconducting transmon qubit, using homodyne detection on an amplified microwave signal. Our modeling makes a realistic assessment of what is possible in current circuit-QED experiments; in particular, we take into account the frequency-dependence of the qubit-induced phase shift for short microwaves pulses. We compare the possible signal-to-noise ratios obtainable with (single-mode) SU(1,1) interferometers with the current coherent measurement and find a considerable reduction in measurement error probability in an experimentally-accessible range of parameters.
References in corpus (11)
- Charge insensitive qubit design derived from the Cooper pair box
- Amplification and squeezing of quantum noise with a tunable Josephson metamaterial
- Nanomechanical motion measured with precision beyond the standard quantum limit
- A widely tunable parametric amplifier based on a SQUID array resonator
- Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect
- High-Fidelity Readout in Circuit Quantum Electrodynamics Using the Jaynes-Cummings Nonlinearity
- Generating Entangled Microwave Radiation Over Two Transmission Lines
- Randomized benchmarking and process tomography for gate errors in a solid-state qubit
- Protocols for optimal readout of qubits using a continuous quantum nondemolition measurement
- Nonlinearities and Parametric Amplification in Superconducting Coplanar Waveguide Resonators
- Non-linear dispersive regime of cavity QED: The dressed dephasing model