Signal Processing

Duzer, T. Van

doi:10.1007/978-3-642-83885-9_11

Cited by 2 publications

(1 citation statement)

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“…The dissipation in the circuit is modeled using the resistively shunted junction model. 19 The CPW cavity, with characteristic impedance Z r Ϸ 50 ⍀, is equivalent to a lumped element resonator when close to resonance with an inductance L r =2Z r / r Ϸ 570 pH and capacitance C r = / 2 r Z r Ϸ 0.56 pF. The lifetime of an excitation in the CPW cavity 18 is T 1,r Ϸ 1 s, which yields R r = T 1,r / C r = 1.8 M⍀.…”

Section: Physical Review B 82 094510 ͑2010͒mentioning

confidence: 99%

Measurement crosstalk between two phase qubits coupled by a coplanar waveguide

et al. 2010

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We analyze the measurement crosstalk between two flux-biased phase qubits coupled by a resonant coplanar waveguide cavity. After the first qubit is measured, the superconducting phase can undergo damped oscillations resulting in an a.c. voltage that produces a frequency chirped noise signal whose frequency crosses that of the cavity. We show experimentally that the coplanar waveguide cavity acts as a bandpass filter that can significantly reduce the crosstalk signal seen by the second qubit when its frequency is far from the cavity's resonant frequency. We present a simple classical description of the qubit behavior that agrees well with the experimental data. These results suggest that measurement crosstalk between superconducting phase qubits can be reduced by use of linear or possibly nonlinear resonant cavities as coupling elements.

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Section: Physical Review B 82 094510 ͑2010͒mentioning

confidence: 99%