Fast quantum non-demolition readout from longitudinal qubit-oscillator interaction

Nicolas Didier; Jérôme Bourassa; Alexandre Blais

doi:10.1103/PhysRevLett.115.203601

Fast quantum non-demolition readout from longitudinal qubit-oscillator interaction

Quantum Physics 2015-11-18 v1 Mesoscale and Nanoscale Physics

Authors: Nicolas Didier , Jérôme Bourassa , Alexandre Blais

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Abstract

We show how to realize high-fidelity quantum non-demolition qubit readout using longitudinal qubit-oscillator interaction. This is realized by modulating the longitudinal coupling at the cavity frequency. The qubit-oscillator interaction then acts as a qubit-state dependent drive on the cavity, a situation that is fundamentally different from the standard dispersive case. Single-mode squeezing can be exploited to exponentially increase the signal-to-noise ratio of this readout protocol. We present an implementation of this idea in circuit quantum electrodynamics and a possible multi-qubit architecture.

Keywords

superconducting qubits circuit quantum electrodynamics quantum decoherence in superconducting qubits

Cite

@article{arxiv.1504.04002,
  title  = {Fast quantum non-demolition readout from longitudinal qubit-oscillator interaction},
  author = {Nicolas Didier and Jérôme Bourassa and Alexandre Blais},
  journal= {arXiv preprint arXiv:1504.04002},
  year   = {2015}
}

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5 pages, 3 figures, Supplemental Material

Fast quantum non-demolition readout from longitudinal qubit-oscillator interaction

Abstract

Keywords

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