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Single-shot qubit readout in circuit quantum electrodynamics

F. Mallet, Florian R. Ong, Agustin Palacios-Laloy +4 more

arXiv:1005.3436Nature PhysicsSep 27, 2009281 citations

Dynamics of dispersive single qubit read-out in circuit QED

R. Bianchetti, Stefan Filipp, Alexandre Blais +1 more

Bulletin of the American Physical SocietyMar 19, 20090 citations

Multiplexed readout of four qubits in 3D circuit QED architecture using a broadband Josephson parametric amplifier

S. Kundu, Nicolas Gheeraert, Sumeru Hazra +4 more

We propose and demonstrate a frequency-multiplexed readout scheme in 3D circuit-quantum electrodynamics (cQED) architecture. We use four transmon qubits coupled to individual rectangular cavities which are aperture-coupled to a common rectangular waveguide feedline. A coaxial to waveguide transformer at the other end of the feedline allows one to launch and collect the multiplexed signal. The reflected readout signal is amplified by an impedance-engineered broadband parametric amplifier with 380 MHz bandwidth. This provides us high fidelity single-shot readout of multiple qubits using compact microwave circuitry, an efficient way for scaling up to more qubits in 3D cQED.We propose and demonstrate a frequency-multiplexed readout scheme in 3D circuit-quantum electrodynamics (cQED) architecture. We use four transmon qubits coupled to individual rectangular cavities which are aperture-coupled to a common rectangular waveguide feedline. A coaxial to waveguide transformer at the other end of the feedline allows one to launch and collect the multiplexed signal. The reflected readout signal is amplified by an impedance-engineered broadband parametric amplifier with 380 MHz bandwidth. This provides us high fidelity single-shot readout of multiple qubits using compact microwave circuitry, an efficient way for scaling up to more qubits in 3D cQED.

Applied Physics LettersApr 29, 201930 citations

Reconfigurable valley topological QED platform for qubit operation

Junhua Dong, Bingsuo Zou, Yongyou Zhang

Multifarious topological crystals are extensively explored because of their unique advantages in manipulating wave transport and immunity against local perturbations. Most of them are studied, however, in feature-fixed systems and therefore, commonly have a challenge in application that requires tunability, such as quantum switches, tunable quantum routers, and quantum storage and reading. Here, we theoretically suggest a reconfigurable valley topological quantum electrodynamics (QED) platform scheme based on the honeycomb lattice of Jaynes-Cummings emitters, which can be implemented by cavity- or circuit-QED cells. Based on such a reconfigurable platform, this work first designs a tunable topological quantum router and then demonstrates how to achieve topological quantum storage and reading in theory. They both signify the remarkable potential of the suggested reconfigurable topological QED platform for qubit operation.Multifarious topological crystals are extensively explored because of their unique advantages in manipulating wave transport and immunity against local perturbations. Most of them are studied, however, in feature-fixed systems and therefore, commonly have a challenge in application that requires tunability, such as quantum switches, tunable quantum routers, and quantum storage and reading. Here, we theoretically suggest a reconfigurable valley topological quantum electrodynamics (QED) platform scheme based on the honeycomb lattice of Jaynes-Cummings emitters, which can be implemented by cavity- or circuit-QED cells. Based on such a reconfigurable platform, this work first designs a tunable topological quantum router and then demonstrates how to achieve topological quantum storage and reading in theory. They both signify the remarkable potential of the suggested reconfigurable topological QED platform for qubit operation.

Physical Review AAug 17, 20232 citations

Circuit quantum electrodynamics with a scanning qubit

Will Shanks, Devin Underwood, James J. Raftery +3 more

Bulletin of the American Physical SocietyMar 1, 20120 citations

Development and characterization of a flux-pumped lumped element Josephson parametric amplifier

Martina Esposito, Joseph Rahamim, Andrew Patterson +11 more

Josephson parametric amplification is a tool of paramount importance in circuit-QED especially for the quantum-noise-limited single-shot read-out of superconducting qubits. We developed a Josephson parametric amplifier (JPA) based on a lumped-element LC resonator, in which the inductance L is composed by a geometric inductance and an array of 4 superconducting quantum interference devices (SQUIDs). We characterized the main figures of merit of the device, obtaining a −3 dB bandwidth BW = 15 MHz for a gain G = 21 dB and a 1 dB compression point P1dB = −115 dBm. The obtained results are promising for the future use of such JPA as the first stage of amplification for single-shot readout of superconducting qubits.Josephson parametric amplification is a tool of paramount importance in circuit-QED especially for the quantum-noise-limited single-shot read-out of superconducting qubits. We developed a Josephson parametric amplifier (JPA) based on a lumped-element LC resonator, in which the inductance L is composed by a geometric inductance and an array of 4 superconducting quantum interference devices (SQUIDs). We characterized the main figures of merit of the device, obtaining a −3 dB bandwidth BW = 15 MHz for a gain G = 21 dB and a 1 dB compression point P1dB = −115 dBm. The obtained results are promising for the future use of such JPA as the first stage of amplification for single-shot readout of superconducting qubits.

EPJ Web of ConferencesJan 1, 20194 citations

Towards single shot read-out in circuit quantum electrodynamics (QED)

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