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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 …
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 …
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 …
High-cooperativity cavity QED with magnons at microwave frequencies
Using a submillimeter-sized YIG (yttrium-iron-garnet) sphere mounted in a magnetic-field-
focusing cavity, we demonstrate an ultrahigh cooperativity of 1 0 5 between magnon and …
focusing cavity, we demonstrate an ultrahigh cooperativity of 1 0 5 between magnon and …
[HTML][HTML] Surface participation and dielectric loss in superconducting qubits
We study the energy relaxation times (T 1) of superconducting transmon qubits in 3D
cavities as a function of dielectric participation ratios of material surfaces. This surface …
cavities as a function of dielectric participation ratios of material surfaces. This surface …
Material matters in superconducting qubits
The progress witnessed within the field of quantum computing has been enabled by the
identification and understanding of interactions between the state of the quantum bit (qubit) …
identification and understanding of interactions between the state of the quantum bit (qubit) …
Planar superconducting resonators with internal quality factors above one million
We describe the fabrication and measurement of microwave coplanar waveguide resonators
with internal quality factors above 10 7 at high microwave powers and over 10 6 at low …
with internal quality factors above 10 7 at high microwave powers and over 10 6 at low …
Improved superconducting qubit coherence using titanium nitride
We demonstrate enhanced relaxation and dephasing times of transmon qubits, up to∼ 60 μ
s, by fabricating the interdigitated shunting capacitors using titanium nitride (TiN) …
s, by fabricating the interdigitated shunting capacitors using titanium nitride (TiN) …
Precision measurement of the microwave dielectric loss of sapphire in the quantum regime with parts-per-billion sensitivity
Dielectric loss is known to limit state-of-the-art superconducting qubit lifetimes. Recent
experiments imply upper bounds on bulk dielectric loss tangents on the order of 100 parts …
experiments imply upper bounds on bulk dielectric loss tangents on the order of 100 parts …