Michael Hatridge
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View article: Engineering a Multilevel Bath for Transmons with Three-Wave Mixing and Parametric Drives
Engineering a Multilevel Bath for Transmons with Three-Wave Mixing and Parametric Drives Open
A quantum system with a tunable bath temperature provides an additional degree of freedom for quantum simulators. Such a system can be realized by parametrically modulating the coupling between the system and the bath. Here, by coupling a …
View article: Quartz phononic crystal resonators for hybrid acoustic quantum memories
Quartz phononic crystal resonators for hybrid acoustic quantum memories Open
Circuit quantum acoustodynamics systems have emerged as a promising platform for quantum information by coupling superconducting qubits to mechanical resonators, with their long-lived mechanical modes serving as quantum memories. We demons…
View article: Exceeding the Parametric Drive Strength Threshold in Nonlinear Circuits
Exceeding the Parametric Drive Strength Threshold in Nonlinear Circuits Open
Superconducting quantum circuits rely on strong drives to implement fast gates, high-fidelity readout, and state stabilization. However, these drives can induce uncontrolled excitations, so-called "ionization", that compromise the fidelity…
View article: The waves-in-space Purcell effect for superconducting qubits
The waves-in-space Purcell effect for superconducting qubits Open
Quantum information processing, especially with quantum error correction, requires both long-lived qubits and fast, quantum non-demolition readout. In superconducting circuits this leads to the requirement to both strongly couple qubits, s…
View article: Spectator-Aware Frequency Allocation in Tunable-Coupler Quantum Architectures
Spectator-Aware Frequency Allocation in Tunable-Coupler Quantum Architectures Open
This paper addresses frequency crowding in SNAIL-based superconducting quantum modules. First, we present design constraints by describing a physical model for realizable gates within a module, and building a fidelity model using error bud…
View article: A neural processing approach to quantum state discrimination
A neural processing approach to quantum state discrimination Open
Although linear quantum amplification has proven essential to the processing of weak quantum signals, extracting higher-order quantum features such as correlations in principle demands nonlinear operations. However, nonlinear processing of…
View article: Engineering a multi-level bath for transmons with three-wave mixing and parametric drives
Engineering a multi-level bath for transmons with three-wave mixing and parametric drives Open
A quantum system with a tunable bath temperature provides an additional degree of freedom for quantum simulators. Such a system can be realized by parametrically modulating the coupling between the system and the bath. Here, by coupling a …
View article: ARQUIN: Architectures for Multinode Superconducting Quantum Computers
ARQUIN: Architectures for Multinode Superconducting Quantum Computers Open
Many proposals to scale quantum technology rely on modular or distributed designs wherein individual quantum processors, called nodes, are linked together to form one large multinode quantum computer (MNQC). One scalable method to construc…
View article: Practical Trainable Temporal Postprocessor for Multistate Quantum Measurement
Practical Trainable Temporal Postprocessor for Multistate Quantum Measurement Open
We develop and demonstrate a trainable temporal postprocessor (TPP) harnessing a simple but versatile machine learning algorithm to provide optimal processing of quantum measurement data subject to arbitrary noise processes for the readout…
View article: Experimental advances with the QICK (Quantum Instrumentation Control Kit) for superconducting quantum hardware
Experimental advances with the QICK (Quantum Instrumentation Control Kit) for superconducting quantum hardware Open
The Quantum Instrumentation Control Kit (QICK) is a standalone open-source qubit controller that was first introduced in 2022. In this follow-up work, we present recent upgrades to the QICK and the experimental use cases they uniquely enab…
View article: Simple, High Saturation Power, Quantum-limited, RF SQUID Array-based Josephson Parametric Amplifiers
Simple, High Saturation Power, Quantum-limited, RF SQUID Array-based Josephson Parametric Amplifiers Open
High-fidelity quantum non-demolition qubit measurement is critical to error correction and rapid qubit feedback in large-scale quantum computing. High-fidelity readout requires passing a short and strong pulse through the qubit's readout r…
View article: Pump-efficient Josephson parametric amplifiers with high saturation power
Pump-efficient Josephson parametric amplifiers with high saturation power Open
Circuit QED based quantum information processing relies on low noise amplification for signal readout. In the realm of microwave superconducting circuits, this amplification is often achieved via Josephson parametric amplifiers (JPA). In t…
View article: Experimental advances with the QICK (Quantum Instrumentation Control Kit) for superconducting quantum hardware
Experimental advances with the QICK (Quantum Instrumentation Control Kit) for superconducting quantum hardware Open
The QICK is a standalone open source qubit controller that was first introduced in 2022. In this follow-up work, we present recent experimental use cases that the QICK uniquely enabled for superconducting qubit systems. These include multi…
View article: Practical Trainable Temporal Postprocessor for Multistate Quantum Measurement
Practical Trainable Temporal Postprocessor for Multistate Quantum Measurement Open
We develop and demonstrate a trainable temporal post-processor (TPP) harnessing a simple but versatile machine learning algorithm to provide optimal processing of quantum measurement data subject to arbitrary noise processes, for the reado…
View article: MIRAGE: Quantum Circuit Decomposition and Routing Collaborative Design using Mirror Gates
MIRAGE: Quantum Circuit Decomposition and Routing Collaborative Design using Mirror Gates Open
Building efficient large-scale quantum computers is a significant challenge due to limited qubit connectivities and noisy hardware operations. Transpilation is critical to ensure that quantum gates are on physically linked qubits, while mi…
View article: Fast superconducting qubit control with sub-harmonic drives
Fast superconducting qubit control with sub-harmonic drives Open
Increasing the fidelity of single-qubit gates requires a combination of faster pulses and increased qubit coherence. However, with resonant qubit drive via a capacitively coupled port, these two objectives are mutually contradictory, as hi…
View article: Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router
Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router Open
One of the primary challenges in realizing large-scale quantum processors is the realization of qubit couplings that balance interaction strength, connectivity, and mode confinement. Moreover, it is very desirable for the device elements t…
View article: Parallel Driving for Fast Quantum Computing Under Speed Limits
Parallel Driving for Fast Quantum Computing Under Speed Limits Open
Increasing quantum circuit fidelity requires an efficient instruction set to avoid errors from decoherence. The choice of a two-qubit (2Q) hardware basis gate depends on a quantum modulator's native Hamiltonian interactions and applied con…
View article: Noise Reduction in Qubit Readout with a Two-Mode Squeezed Interferometer
Noise Reduction in Qubit Readout with a Two-Mode Squeezed Interferometer Open
Fault-tolerant quantum information processing with flawed qubits and gates requires highly efficient, quantum nondemolition qubit readout. In superconducting circuits, qubit readout using coherent light with fidelity above 99% has been ach…
View article: Architectures for Multinode Superconducting Quantum Computers
Architectures for Multinode Superconducting Quantum Computers Open
Many proposals to scale quantum technology rely on modular or distributed designs where individual quantum processors, called nodes, are linked together to form one large multinode quantum computer (MNQC). One scalable method to construct …
View article: Quantum-limited amplification without instability
Quantum-limited amplification without instability Open
Quantum parametric amplifiers typically generate by operating in proximity to a point of dynamical instability. We consider an alternate general strategy where quantum-limited, large-gain amplification is achieved without any proximity to …
View article: Co-Designed Architectures for Modular Superconducting Quantum Computers
Co-Designed Architectures for Modular Superconducting Quantum Computers Open
Noisy, Intermediate Scale Quantum (NISQ) computers have reached the point where they can show the potential for quantum advantage over classical computing. Unfortunately, NISQ machines introduce sufficient noise that even for moderate size…
View article: A modular quantum computer based on a quantum state router.
A modular quantum computer based on a quantum state router. Open
A central challenge for realizing large-scale quantum processors is the design and realization of qubit-qubit connections: we must be able to perform efficient gates between qubits, yet prevent connections from spoiling qubit quality or pr…
View article: Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router
Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router Open
One of the primary challenges in realizing large-scale quantum processors is the realization of qubit couplings that balance interaction strength, connectivity, and mode confinement. Moreover, it is very desirable for the device elements t…
View article: Superconducting contact and quantum interference between two-dimensional van der Waals and three-dimensional conventional superconductors
Superconducting contact and quantum interference between two-dimensional van der Waals and three-dimensional conventional superconductors Open
Atomically thin two-dimensional (2D) transition-metal dichalcogenide (TMD) superconductors enable uniform, flat, and clean van der Waals tunneling interfaces, motivating their integration into conventional superconducting circuits. However…
View article: Proposal for a continuous wave laser with linewidth well below the standard quantum limit
Proposal for a continuous wave laser with linewidth well below the standard quantum limit Open
Due to their high coherence, a laser is a ubiquitous tool in science. We show that by engineering the coupling between the gain medium and the laser cavity as well as the laser cavity and the output port, it is possible to eliminate most o…
View article: A New Quantum Limit on Laser Linewidth
A New Quantum Limit on Laser Linewidth Open
Due to their high coherence, Lasers are a ubiquitous tool in science. The standard quantum limit for the phase coherence time was first introduced by [A. Schawlow and C. Townes, Phys. Rev. 112, 1940 (1958)], who showed that the minimum pos…