Materials challenges and opportunities for quantum computing hardware
BACKGROUND The past two decades have seen intense efforts aimed at building quantum
computing hardware with the potential to solve problems that are intractable on classical …
computing hardware with the potential to solve problems that are intractable on classical …
Towards understanding two-level-systems in amorphous solids: insights from quantum circuits
Amorphous solids show surprisingly universal behaviour at low temperatures. The
prevailing wisdom is that this can be explained by the existence of two-state defects within …
prevailing wisdom is that this can be explained by the existence of two-state defects within …
[HTML][HTML] A quantum engineer's guide to superconducting qubits
The aim of this review is to provide quantum engineers with an introductory guide to the
central concepts and challenges in the rapidly accelerating field of superconducting …
central concepts and challenges in the rapidly accelerating field of superconducting …
Surpassing millisecond coherence in on chip superconducting quantum memories by optimizing materials and circuit design
The performance of superconducting quantum circuits for quantum computing has advanced
tremendously in recent decades; however, a comprehensive understanding of relaxation …
tremendously in recent decades; however, a comprehensive understanding of relaxation …
Materials loss measurements using superconducting microwave resonators
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) …
losses. In particular, coherence times are typically bounded by two-level system (TLS) …
Moving beyond the transmon: Noise-protected superconducting quantum circuits
Artificial atoms realized by superconducting circuits offer unique opportunities to store and
process quantum information with high fidelity. Among them, implementations of circuits that …
process quantum information with high fidelity. Among them, implementations of circuits that …
Disentangling losses in tantalum superconducting circuits
Superconducting qubits are a leading system for realizing large-scale quantum processors,
but overall gate fidelities suffer from coherence times limited by microwave dielectric loss …
but overall gate fidelities suffer from coherence times limited by microwave dielectric loss …
Semiconductor-nanowire-based superconducting qubit
We introduce a hybrid qubit based on a semiconductor nanowire with an epitaxially grown
superconductor layer. Josephson energy of the transmonlike device (“gatemon”) is …
superconductor layer. Josephson energy of the transmonlike device (“gatemon”) is …
Reducing intrinsic loss in superconducting resonators by surface treatment and deep etching of silicon substrates
We present microwave-frequency NbTiN resonators on silicon, systematically achieving
internal quality factors above 1 M in the quantum regime. We use two techniques to reduce …
internal quality factors above 1 M in the quantum regime. We use two techniques to reduce …
Loss mechanisms in superconducting thin film microwave resonators
We present a systematic analysis of the internal losses of superconducting coplanar
waveguide microwave resonators based on niobium thin films on silicon substrates. In …
waveguide microwave resonators based on niobium thin films on silicon substrates. In …