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1.
Sci Adv ; 8(16): eabl6698, 2022 Apr 22.
Article in English | MEDLINE | ID: mdl-35452292

ABSTRACT

We report high qubit coherence as well as low cross-talk and single-qubit gate errors in a superconducting circuit architecture that promises to be tileable to two-dimensional (2D) lattices of qubits. The architecture integrates an inductively shunted cavity enclosure into a design featuring nongalvanic out-of-plane control wiring and qubits and resonators fabricated on opposing sides of a substrate. The proof-of-principle device features four uncoupled transmon qubits and exhibits average energy relaxation times T1 = 149(38) µs, pure echoed dephasing times Tϕ,e = 189(34) µs, and single-qubit gate fidelities F = 99.982(4)% as measured by simultaneous randomized benchmarking. The 3D integrated nature of the control wiring means that qubits will remain addressable as the architecture is tiled to form larger qubit lattices. Band structure simulations are used to predict that the tiled enclosure will still provide a clean electromagnetic environment to enclosed qubits at arbitrary scale.

2.
Sensors (Basel) ; 20(8)2020 Apr 21.
Article in English | MEDLINE | ID: mdl-32326321

ABSTRACT

Differentially driven devices represent a highly promising research field for radio frequency (RF), microwave (MW), and millimeter-wave (mmWave) designers and engineers. Designs employing differential signals are essential elements in low-noise fourth-generation (4G) and fifth-generation (5G) communications. Apart from the conventional planar MW components, differential-fed balanced microstrip filters, as promising alternatives, have several advantages, including high common-mode rejection, low unwanted radiation levels, high noise immunity, and wideband harmonic suppression. In this paper, a comprehensive and in-depth review of the existing research on differential-fed microstrip filter designs are presented and discussed with a focus on recent advances in this research and the challenges facing the researchers. A comparison between different design techniques is presented and discussed in detail to provide the researchers with the advantages and disadvantages of each technique that could be of interest to a specific application. Challenges and future developments of balanced microstrip bandpass filters (BPFs) are also presented in this paper. Balanced filters surveyed include recent single-, dual-, tri-, and wide-band BPFs, which employ different design techniques and accomplish different performances for current and future wireless applications.

3.
Pediatr Infect Dis J ; 33(10): 1087-9, 2014 Oct.
Article in English | MEDLINE | ID: mdl-25361189

ABSTRACT

Polymerase chain reaction-based surveillance for bacterial meningitis including 841 children revealed 246 with bacterial DNA in cerebrospinal fluid samples of which 53% were Streptococcus pneumoniae, 19% Neisseria meningitidis, and 16% Haemophilus influenzae type b. The most common S. pneumoniae serotypes/serogroups were 1, 19F, 6A/6B, 23F, 5, 14, 18 and 19A. Among 47 meningococci, 86% were serogroup B, 6% serogroup C, 3% serogroup A, 3% serogroup X and 3% serogroup W.


Subject(s)
Cerebrospinal Fluid/microbiology , Epidemiological Monitoring , Meningitis, Bacterial/diagnosis , Meningitis, Bacterial/epidemiology , Molecular Diagnostic Techniques/methods , Polymerase Chain Reaction/methods , Adolescent , Bacteria/classification , Bacteria/isolation & purification , Child , Child, Preschool , Female , Humans , Infant , Male , Meningitis, Bacterial/microbiology , Prevalence , Prospective Studies , Serotyping , Turkey/epidemiology
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