Josephson directional amplifier for quantum measurement of superconducting circuits

Baleegh Abdo; Katrina Sliwa; S. Shankar; Michael Hatridge; Luigi Frunzio; Robert Schoelkopf; Michel Devoret

doi:10.1103/PhysRevLett.112.167701

Josephson directional amplifier for quantum measurement of superconducting circuits

Superconductivity 2014-05-01 v1 Quantum Physics

Authors: Baleegh Abdo , Katrina Sliwa , S. Shankar , Michael Hatridge , Luigi Frunzio , Robert Schoelkopf , Michel Devoret

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Abstract

We have realized a microwave quantum-limited amplifier that is directional and can therefore function without the front circulator needed in many quantum measurements. The amplification takes place in only one direction between the input and output ports. Directionality is achieved by multi-pump parametric amplification combined with wave interference. We have verified the device noise performances by using it to readout a superconducting qubit and observed quantum jumps. With an improved version of this device, qubit and preamplifer could be integrated on the same chip.

Keywords

Josephson amplifier directional amplifier quantum-limited amplification superconducting qubit parametric amplification quantum measurement

Cite

@article{arxiv.1311.5345,
  title  = {Josephson directional amplifier for quantum measurement of superconducting circuits},
  author = {Baleegh Abdo and Katrina Sliwa and S. Shankar and Michael Hatridge and Luigi Frunzio and Robert Schoelkopf and Michel Devoret},
  journal= {arXiv preprint arXiv:1311.5345},
  year   = {2014}
}

Josephson directional amplifier for quantum measurement of superconducting circuits

Abstract

Keywords

Cite

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