Christopher Eichler
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View article: Calibrating magnetic flux control in superconducting circuits by compensating distortions on timescales from nanoseconds up to tens of microseconds
Calibrating magnetic flux control in superconducting circuits by compensating distortions on timescales from nanoseconds up to tens of microseconds Open
Fast tuning of the transition frequency of superconducting qubits using magnetic flux is essential, for example, for realizing high-fidelity two-qubit gates with low leakage or for reducing errors in dispersive qubit readout. To apply accu…
View article: Calibrating Magnetic Flux Control in Superconducting Circuits by Compensating Distortions on Time Scales from Nanoseconds up to Tens of Microseconds
Calibrating Magnetic Flux Control in Superconducting Circuits by Compensating Distortions on Time Scales from Nanoseconds up to Tens of Microseconds Open
Fast tuning of the transition frequency of superconducting qubits using magnetic flux is essential, for example, for realizing high-fidelity two-qubit gates with low leakage or for reducing errors in dispersive qubit readout. To apply accu…
View article: Experimentally Informed Decoding of Stabilizer Codes Based on Syndrome Correlations
Experimentally Informed Decoding of Stabilizer Codes Based on Syndrome Correlations Open
High-fidelity decoding of quantum error correction codes relies on an accurate experimental model of the physical errors occurring in the device. Because error probabilities can depend on the context of the applied operations, the error mo…
View article: Deterministic generation of a 20-qubit two-dimensional photonic cluster state
Deterministic generation of a 20-qubit two-dimensional photonic cluster state Open
Multidimensional cluster states are a key resource for robust quantum communication, measurement-based quantum computing and quantum metrology. Here, we present a device capable of emitting large-scale entangled microwave photonic states i…
View article: Mitigating Losses of Superconducting Qubits Strongly Coupled to Defect Modes
Mitigating Losses of Superconducting Qubits Strongly Coupled to Defect Modes Open
The dominant contribution to the energy relaxation of state-of-the-art superconducting qubits is often attributed to their coupling to an ensemble of material defects which behave as two-level systems. These defects have varying microscopi…
View article: Improved parameter targeting in 3D-integrated superconducting circuits through a polymer spacer process
Improved parameter targeting in 3D-integrated superconducting circuits through a polymer spacer process Open
Three-dimensional device integration facilitates the construction of superconducting quantum information processors with more than several tens of qubits by distributing elements such as control wires, qubits, and resonators between multip…
View article: Intermodulation Distortion in a Josephson Traveling-Wave Parametric Amplifier
Intermodulation Distortion in a Josephson Traveling-Wave Parametric Amplifier Open
Josephson traveling-wave parametric amplifiers (TWPAs) enable the amplification of weak microwave signals close to the quantum limit with large bandwidth, which has a broad range of applications in superconducting quantum computing and in …
View article: Calibration of Drive Nonlinearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification
Calibration of Drive Nonlinearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification Open
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View article: Improved Parameter Targeting in 3D-Integrated Superconducting Circuits through a Polymer Spacer Process
Improved Parameter Targeting in 3D-Integrated Superconducting Circuits through a Polymer Spacer Process Open
Three-dimensional device integration facilitates the construction of superconducting quantum information processors with more than several tens of qubits by distributing elements such as control wires, qubits, and resonators between multip…
View article: Tunable coupler to fully decouple and maximally localize superconducting qubits
Tunable coupler to fully decouple and maximally localize superconducting qubits Open
Enhancing the capabilities of superconducting quantum hardware, requires higher gate fidelities and lower crosstalk, particularly in larger scale devices, in which qubits are coupled to multiple neighbors. Progress towards both of these ob…
View article: Calibration of Drive Non-Linearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification
Calibration of Drive Non-Linearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification Open
The ability to execute high-fidelity operations is crucial to scaling up quantum devices to large numbers of qubits. However, signal distortions originating from non-linear components in the control lines can limit the performance of singl…
View article: Realizing a deep reinforcement learning agent discovering real-time feedback control strategies for a quantum system
Realizing a deep reinforcement learning agent discovering real-time feedback control strategies for a quantum system Open
To realize the full potential of quantum technologies, finding good strategies to control quantum information processing devices in real time becomes increasingly important. Usually these strategies require a precise understanding of the d…
View article: Intermodulation Distortion in a Josephson Traveling Wave Parametric Amplifier
Intermodulation Distortion in a Josephson Traveling Wave Parametric Amplifier Open
Josephson traveling wave parametric amplifiers enable the amplification of weak microwave signals close to the quantum limit with large bandwidth, which has a broad range of applications in superconducting quantum computing and in the oper…
View article: Frequency Up-Conversion Schemes for Controlling Superconducting Qubits
Frequency Up-Conversion Schemes for Controlling Superconducting Qubits Open
High-fidelity control of superconducting qubits requires the generation of microwave-frequency pulses precisely tailored on nanosecond timescales. These pulses are most commonly synthesized by up-converting and superimposing two narrow-ban…
View article: Building blocks of a flip-chip integrated superconducting quantum processor
Building blocks of a flip-chip integrated superconducting quantum processor Open
We have integrated single and coupled superconducting transmon qubits into flip-chip modules. Each module consists of two chips—one quantum chip and one control chip—that are bump-bonded together. We demonstrate time-averaged coherence tim…
View article: Realization of a Universal Quantum Gate Set for Itinerant Microwave Photons
Realization of a Universal Quantum Gate Set for Itinerant Microwave Photons Open
Deterministic photon-photon gates enable the controlled generation of entanglement between mobile carriers of quantum information. Such gates have thus far been exclusively realized in the optical domain and by relying on post-selection. H…
View article: Building Blocks of a Flip-Chip Integrated Superconducting Quantum\n Processor
Building Blocks of a Flip-Chip Integrated Superconducting Quantum\n Processor Open
We have integrated single and coupled superconducting transmon qubits into\nflip-chip modules. Each module consists of two chips -- one quantum chip and\none control chip -- that are bump-bonded together. We demonstrate time-averaged\ncohe…
View article: Realization of a Universal Quantum Gate Set for Itinerant Microwave Photons
Realization of a Universal Quantum Gate Set for Itinerant Microwave Photons Open
Deterministic photon-photon gates enable the controlled generation of entanglement between mobile carriers of quantum information. Such gates have thus far been exclusively realized in the optical domain and by relying on post-selection. H…
View article: Parity Detection of Propagating Microwave Fields
Parity Detection of Propagating Microwave Fields Open
The parity of the number of elementary excitations present in a quantum system provides important insights into its physical properties. Parity measurements are used, for example, to tomographically reconstruct quantum states or to determi…
View article: Improving the Performance of Deep Quantum Optimization Algorithms with Continuous Gate Sets
Improving the Performance of Deep Quantum Optimization Algorithms with Continuous Gate Sets Open
Variational quantum algorithms are believed to be promising for solving computationally hard problems on noisy intermediate-scale quantum (NISQ) systems. Gaining computational power from these algorithms critically relies on the mitigation…
View article: Two-photon resonance fluorescence of a ladder-type atomic system
Two-photon resonance fluorescence of a ladder-type atomic system Open
Multi-photon emitters are a sought-after resource in quantum photonics.\nNonlinear interactions between a multi-level atomic system and a coherent drive\ncan lead to resonant two-photon emission, but harvesting light from this\nprocess has…
View article: Entanglement stabilization using ancilla-based parity detection and real-time feedback in superconducting circuits
Entanglement stabilization using ancilla-based parity detection and real-time feedback in superconducting circuits Open
Fault-tolerant quantum computing relies on the ability to detect and correct errors, which in quantum error correction codes is typically achieved by projectively measuring multi-qubit parity operators and by conditioning operations on the…
View article: Observation of the Crossover from Photon Ordering to Delocalization in Tunably Coupled Resonators
Observation of the Crossover from Photon Ordering to Delocalization in Tunably Coupled Resonators Open
Networks of nonlinear resonators offer intriguing perspectives as quantum simulators for nonequilibrium many-body phases of driven-dissipative systems. Here, we employ photon correlation measurements to study the radiation fields emitted f…