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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

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Published on: May 30, 2014

Two-qubit state tomography using a joint dispersive readout.

S Filipp1, P Maurer, P J Leek

  • 1Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland. filipp@phys.ethz.ch

Physical Review Letters
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

We developed a new method for joint readout of two superconducting qubits, enabling full two-qubit correlation extraction without single-shot measurements. This advances quantum information science by simplifying quantum state tomography.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Superconducting Qubits

Background:

  • Quantum state tomography is crucial for characterizing multi-qubit states and correlations.
  • Accurate characterization of multi-qubit states is essential for advancing quantum information science.

Purpose of the Study:

  • To report a novel method for joint simultaneous readout of two superconducting qubits.
  • To demonstrate extraction of full two-qubit correlations without individual single-shot qubit readout.

Main Methods:

  • Utilizing dispersively coupled superconducting qubits to a shared microwave resonator.
  • Exploiting the nonlinear dependence of resonator transmission on qubit-state-dependent cavity frequency.
  • Applying standard tomographic techniques for density matrix reconstruction.

Main Results:

  • Achieved joint simultaneous readout of two superconducting qubits.
  • Successfully extracted full two-qubit correlations.
  • Reconstructed the density matrix of two-qubit quantum states without single-shot readout.

Conclusions:

  • The developed method simplifies quantum state tomography for two-qubit systems.
  • This technique offers a more efficient approach to characterizing multi-qubit states and their correlations.
  • The findings contribute to the advancement of quantum information processing and quantum computing.