Joel Grebel
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View article: Observation and mitigation of microwave echoes from dielectric defects in Josephson traveling-wave amplifiers
Observation and mitigation of microwave echoes from dielectric defects in Josephson traveling-wave amplifiers Open
International audience
View article: Quantum secret sharing in a triangular superconducting quantum network
Quantum secret sharing in a triangular superconducting quantum network Open
We present a three-node quantum communication testbed with a triangular topology, each side of the triangle formed by a 1.3-meter-long transmission line. We demonstrate state transfer and entanglement generation between any two nodes, gene…
View article: Deterministic multi-phonon entanglement between two mechanical resonators on separate substrates
Deterministic multi-phonon entanglement between two mechanical resonators on separate substrates Open
Mechanical systems have emerged as a compelling platform for applications in quantum information, leveraging advances in the control of phonons, the quanta of mechanical vibrations. Experiments have demonstrated the control and measurement…
View article: Deterministic multi-phonon entanglement between two mechanical resonators on separate substrates
Deterministic multi-phonon entanglement between two mechanical resonators on separate substrates Open
Mechanical systems have emerged as a compelling platform for applications in quantum information, leveraging recent advances in the control of phonons, the quanta of mechanical vibrations. Several experiments have demonstrated control and …
View article: Modular Quantum Processor with an All-to-All Reconfigurable Router
Modular Quantum Processor with an All-to-All Reconfigurable Router Open
Superconducting qubits provide a promising approach to large-scale fault-tolerant quantum computing. However, qubit connectivity on a planar surface is typically restricted to only a few neighboring qubits. Achieving longer-range and more …
View article: Modular quantum processor with an all-to-all reconfigurable router
Modular quantum processor with an all-to-all reconfigurable router Open
Superconducting qubits provide a promising approach to large-scale fault-tolerant quantum computing. However, qubit connectivity on a planar surface is typically restricted to only a few neighboring qubits. Achieving longer-range and more …
View article: A GHz-frequency multistrip acoustic beam splitter for quantum applications
A GHz-frequency multistrip acoustic beam splitter for quantum applications Open
We demonstrate a microwave-frequency, two-track acoustic beam splitter, based on a multistrip coupler design matched to four unidirectional transducers, two on each of the two acoustic tracks that make up the device. We explain the device …
View article: Bidirectional Multiphoton Communication between Remote Superconducting Nodes
Bidirectional Multiphoton Communication between Remote Superconducting Nodes Open
Quantum communication test beds provide a useful resource for experimentally investigating a variety of communication protocols. Here we demonstrate a superconducting circuit test bed with bidirectional multiphoton state transfer capabilit…
View article: Bidirectional multi-photon communication between remote superconducting nodes
Bidirectional multi-photon communication between remote superconducting nodes Open
Quantum communication testbeds provide a useful resource for experimentally investigating a variety of communication protocols. Here we demonstrate a superconducting circuit testbed with bidirectional multi-photon state transfer capability…
View article: Broadband bandpass Purcell filter for circuit quantum electrodynamics
Broadband bandpass Purcell filter for circuit quantum electrodynamics Open
In circuit quantum electrodynamics, qubits are typically measured using dispersively coupled readout resonators. Coupling between each readout resonator and its electrical environment, however, reduces the qubit lifetime via the Purcell ef…
View article: Two-dimensional optomechanical crystal resonator in gallium arsenide
Two-dimensional optomechanical crystal resonator in gallium arsenide Open
In the field of quantum computation and communication there is a compelling need for quantum-coherent frequency conversion between microwave electronics and infra-red optics. A promising platform for this is an optomechanical crystal reson…
View article: Broadband Bandpass Purcell Filter for Circuit Quantum Electrodynamics
Broadband Bandpass Purcell Filter for Circuit Quantum Electrodynamics Open
In circuit quantum electrodynamics (QED), qubits are typically measured using dispersively-coupled readout resonators. Coupling between each readout resonator and its electrical environment however reduces the qubit lifetime via the Purcel…
View article: Splitting phonons: Building a platform for linear mechanical quantum computing
Splitting phonons: Building a platform for linear mechanical quantum computing Open
Linear optical quantum computing provides a desirable approach to quantum computing, with only a short list of required computational elements. The similarity between photons and phonons points to the interesting potential for linear mecha…
View article: Developing a platform for linear mechanical quantum computing
Developing a platform for linear mechanical quantum computing Open
Linear optical quantum computing provides a desirable approach to quantum computing, with a short list of required elements. The similarity between photons and phonons points to the interesting potential for linear mechanical quantum compu…
View article: Entanglement Purification and Protection in a Superconducting Quantum Network
Entanglement Purification and Protection in a Superconducting Quantum Network Open
High-fidelity quantum entanglement is a key resource for quantum communication and distributed quantum computing, enabling quantum state teleportation, dense coding, and quantum encryption. Any sources of decoherence in the communication c…
View article: Superconducting qubits in a flip-chip architecture
Superconducting qubits in a flip-chip architecture Open
Flip-chip architectures have recently enabled significant scaling-up of multi-qubit circuits and have been used to assemble hybrid quantum systems that combine different substrates, for example, for quantum acoustics experiments. The stand…
View article: Flux-pumped impedance-engineered broadband Josephson parametric amplifier
Flux-pumped impedance-engineered broadband Josephson parametric amplifier Open
Broadband quantum-limited amplifiers play a critical role in the single-shot readout of superconducting qubits, but a popular implementation, the traveling wave parametric amplifier, involves a complex design and fabrication process. Here,…
View article: Measurements of a quantum bulk acoustic resonator using a superconducting qubit
Measurements of a quantum bulk acoustic resonator using a superconducting qubit Open
Phonon modes at microwave frequencies can be cooled to their quantum ground state using conventional cryogenic refrigeration, providing a convenient way to study and manipulate quantum states at the single phonon level. Phonons are of part…
View article: Continuous and Time-Domain Coherent Signal Conversion between Optical and Microwave Frequencies
Continuous and Time-Domain Coherent Signal Conversion between Optical and Microwave Frequencies Open
A quantum network consisting of computational nodes connected by high-fidelity communication channels could expand information-processing capabilities significantly beyond those of classical networks. Superconducting qubits hold promise fo…
View article: Deterministic multi-qubit entanglement in a quantum network
Deterministic multi-qubit entanglement in a quantum network Open
Quantum entanglement is a key resource for quantum computation and quantum communication \cite{Nielsen2010}. Scaling to large quantum communication or computation networks further requires the deterministic generation of multi-qubit entang…
View article: Remote Entanglement via Adiabatic Passage Using a Tunably Dissipative Quantum Communication System
Remote Entanglement via Adiabatic Passage Using a Tunably Dissipative Quantum Communication System Open
Effective quantum communication between remote quantum nodes requires high fidelity quantum state transfer and remote entanglement generation. Recent experiments have demonstrated that microwave photons, as well as phonons, can be used to …
View article: Quantum Erasure Using Entangled Surface Acoustic Phonons
Quantum Erasure Using Entangled Surface Acoustic Phonons Open
Using the deterministic, on-demand generation of two entangled phonons, we demonstrate a quantum eraser protocol in a phononic interferometer where the which-path information can be heralded during the interference process. Omitting the he…
View article: Unidirectional distributed acoustic reflection transducers for quantum applications
Unidirectional distributed acoustic reflection transducers for quantum applications Open
Recent significant advances in coupling superconducting qubits to acoustic wave resonators have led to demonstrations of quantum control of surface and bulk acoustic resonant modes as well as Wigner tomography of quantum states in these mo…
View article: Simple non-galvanic flip-chip integration method for hybrid quantum systems
Simple non-galvanic flip-chip integration method for hybrid quantum systems Open
A challenge faced by experimenters exploring hybrid quantum systems is how to integrate and interconnect different materials and different substrates in a quantum-coherent fashion. Here, we present a simple and inexpensive flip-chip bondin…