G. A. Peairs
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View article: Preserving Phase Coherence and Linearity in Cat Qubits with Exponential Bit-Flip Suppression
Preserving Phase Coherence and Linearity in Cat Qubits with Exponential Bit-Flip Suppression Open
Cat qubits, a type of bosonic qubit encoded in a harmonic oscillator, can exhibit an exponential noise bias against bit-flip errors with increasing mean photon number. Here, we focus on cat qubits stabilized by two-photon dissipation, wher…
View article: Hardware-efficient quantum error correction via concatenated bosonic qubits
Hardware-efficient quantum error correction via concatenated bosonic qubits Open
To solve problems of practical importance1,2, quantum computers probably need to incorporate quantum error correction, in which a logical qubit is redundantly encoded in many noisy physical qubits3-5. The large physical-qubit overhead asso…
View article: Preserving phase coherence and linearity in cat qubits with exponential bit-flip suppression
Preserving phase coherence and linearity in cat qubits with exponential bit-flip suppression Open
Cat qubits, a type of bosonic qubit encoded in a harmonic oscillator, can exhibit an exponential noise bias against bit-flip errors with increasing mean photon number. Here, we focus on cat qubits stabilized by two-photon dissipation, wher…
View article: Hardware-efficient quantum error correction via concatenated bosonic qubits
Hardware-efficient quantum error correction via concatenated bosonic qubits Open
In order to solve problems of practical importance, quantum computers will likely need to incorporate quantum error correction, where a logical qubit is redundantly encoded in many noisy physical qubits. The large physical-qubit overhead t…
View article: Demonstrating a Long-Coherence Dual-Rail Erasure Qubit Using Tunable Transmons
Demonstrating a Long-Coherence Dual-Rail Erasure Qubit Using Tunable Transmons Open
Quantum error correction with erasure qubits promises significant advantages over standard error correction due to favorable thresholds for erasure errors. To realize this advantage in practice requires a qubit for which nearly all errors …
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: 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: 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…
View article: Fast and efficient transducers for microwave-optical quantum communication
Fast and efficient transducers for microwave-optical quantum communication Open
A quantum network consisting of computational nodes connected by high-fidelity communication channels could expand information-processing capabilities beyond those of classical networks. Superconducting qubits hold promise for scalable qua…