Measurement of the entanglement of two superconducting qubits via state tomography

  • Steffen M
  • Ansmann M
  • Bialczak R
 et al. 
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Abstract

Demonstration of quantum entanglement, a key resource in quantum computation arising from a nonclassical correlation of states, requires complete measurement of all states in varying bases. By using simultaneous measurement and state tomography, we demonstrated entanglement between two solid-state qubits. Single qubit operations and capacitive coupling between two super-conducting phase qubits were used to generate a Bell-type state. Full two-qubit tomography yielded a density matrix showing an entangled state with fidelity up to 87%. Our results demonstrate a high degree of unitary control of the system, indicating that larger implementations are within reach.

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Authors

  • Matthias Steffen

  • M. Ansmann

  • Radoslaw C. Bialczak

  • H. Katz

  • Erik Lucero

  • R. McDermott

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