Readout for Phase Qubits without Josephson Junctions

Abstract

We present a novel readout scheme for phase qubits which eliminates the read-out SQUID so that the entire qubit and measurement circuitry only requires a single Josephson junction. Our scheme capacitively couples the phase qubit directly to a transmission line and detects its state after the measurement pulse by determining a frequency shift observable in the forward scattering parameter of the readout microwaves. This readout is extendable to multiple phase qubits coupled to a common readout line and can in principle be used for other flux biased qubits having two quasi-stable readout configurations.

References in corpus (3)

• Microwave Dielectric Loss at Single Photon Energies and milliKelvin Temperatures
• State tomography of capacitively shunted phase qubits with high fidelity
• Nondestructive readout for a superconducting flux qubit

Cited by in corpus (9)

• Surface loss simulations of superconducting coplanar waveguide resonators
• Observation of classical-quantum crossover of 1/f flux noise and its paramagnetic temperature dependence
• High coherence hybrid superconducting qubit
• Multiplexed dispersive readout of superconducting phase qubits
• Dispersive readout scheme for a Josephson phase qubit
• Remote Sensing and Control of Phase Qubits
• Nonlinear spectroscopy of superconducting anharmonic resonators
• Fine tuning of phase qubit parameters for optimization of fast single-pulse readout
• Non-demolition Adiabatic Measurement of the Phase Qubit State