342 citations · 1.7k across the 16 of their papers we have counts for
16 papers
A digitally controlled silicon quantum processing unit
Members of the HRL Quantum Team, Collaborators, : +255
Commercially-relevant quantum computers will require large numbers of high-performing qubits that can be manufactured, integrated, and controlled at scale. Silicon exchange-only (E…
Two-dimensional Si spin qubit arrays with multilevel interconnects
Sieu D. Ha, Edwin Acuna, Kate Raach +26
The promise of quantum computation is contingent upon physical qubits with both low gate error rate and broad scalability. Silicon-based spins are a leading qubit platform, but dem…
Full-permutation dynamical decoupling in triple-quantum-dot spin qubits
Bo Sun, Teresa Brecht, Bryan Fong +20
Dynamical decoupling of spin qubits in silicon can enhance fidelity and be used to extract the frequency spectra of noise processes. We demonstrate a full-permutation dynamical dec…
Fast and high-fidelity state preparation and measurement in triple-quantum-dot spin qubits
Jacob Z. Blumoff, Andrew S. Pan, Tyler E. Keating +19
We demonstrate rapid, high-fidelity state preparation and measurement in exchange-only Si/SiGe triple-quantum-dot qubits. Fast measurement integration ( ns) and initialization…
Ac losses in field-cooled type I superconducting cavities
G. Catelani, K. Li, C. J. Axline +4
As superconductors are cooled below their critical temperature, stray magnetic flux can become trapped in regions that remain normal. The presence of trapped flux facilitates dissi…
Detuning Axis Pulsed Spectroscopy of Valley-Orbital States in Si/SiGe Quantum Dots
Edward H. Chen, Kate Raach, Andrew Pan +16
Silicon quantum dot qubits must contend with low-lying valley excited states which are sensitive functions of the quantum well heterostructure and disorder; quantifying and maximiz…
Materials loss measurements using superconducting microwave resonators
Corey Rae Harrington McRae, Haozhi Wang, Jiansong Gao +5
The performance of superconducting circuits for quantum computing is limited by materials losses. In particular, coherence times are typically bounded by two-level system (TLS) los…
Quantum back-action of variable-strength measurement
M. Hatridge, S. Shankar, M. Mirrahimi +9
Measuring a quantum system can randomly perturb its state. The strength and nature of this back-action depends on the quantity which is measured. In a partial measurement performed…
Micromachined integrated quantum circuit containing a superconducting qubit
T. Brecht, Y. Chu, C. Axline +6
We present a device demonstrating a lithographically patterned transmon integrated with a micromachined cavity resonator. Our two-cavity, one-qubit device is a multilayer microwave…
Suspending superconducting qubits by silicon micromachining
Y. Chu, C. Axline, C. Wang +4
We present a method for relieving aluminum 3D transmon qubits from a silicon substrate using micromachining. Our technique is a high yield, one-step deep reactive ion etch that req…
Surface participation and dielectric loss in superconducting qubits
Chen Wang, Christopher Axline, Yvonne Y. Gao +4
We study the energy relaxation times () of superconducting transmon qubits in 3D cavities as a function of dielectric participation ratios of material surfaces. This surface p…
Multilayer microwave integrated quantum circuits for scalable quantum computing
T. Brecht, W. Pfaff, C. Wang +4
As experimental quantum information processing (QIP) rapidly advances, an emerging challenge is to design a scalable architecture that combines various quantum elements into a comp…
Demonstration of superconducting micromachined cavities
T. Brecht, M. Reagor, Y. Chu +5
Superconducting enclosures will be key components of scalable quantum computing devices based on circuit quantum electrodynamics (cQED). Within a densely integrated device, they ca…
Measurement and Control of Quasiparticle Dynamics in a Superconducting Qubit
Chen Wang, Yvonne Y. Gao, Ioan M. Pop +9
Superconducting circuits have attracted growing interest in recent years as a promising candidate for fault-tolerant quantum information processing. Extensive efforts have always b…
Non-Poissonian Quantum Jumps of a Fluxonium Qubit due to Quasiparticle Excitations
Uri Vool, Ioan M. Pop, Katrina Sliwa +12
As the energy relaxation time of superconducting qubits steadily improves, non-equilibrium quasiparticle excitations above the superconducting gap emerge as an increasingly relevan…
Reaching 10 ms single photon lifetimes for superconducting aluminum cavities
M. Reagor, Hanhee Paik, G. Catelani +10
Three-dimensional microwave cavities have recently been combined with superconducting qubits in the circuit quantum electrodynamics (cQED) architecture. These cavities should have…