Testing Hardy's ladder proof of nonlocality by joint measurements of qubits

  • Authors:

  • Hao Yuan;Lian-Fu Wei

  • Affiliations:

  • Quantum Optoelectronics Laboratory, School of Physics Science and Technology, Southwest Jiaotong University, Chengdu, China 610031;Quantum Optoelectronics Laboratory, School of Physics Science and Technology, Southwest Jiaotong University, Chengdu, China 610031 and State Key Laboratory of Optoelectronic Materials and Technolo ...

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2013

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Abstract

We propose an experimentally feasible scheme to test Hardy's ladder proof of nonlocality with two qubits (two-level atoms) dispersively coupled to a driven cavity. First, we find that the required nonmaximally entangled two-qubit pure state can be prepared by only one-step two-qubit operation from the ground state $$|00\rangle $$ | 00 驴 , assisted by two single-qubit gates. Next, we perform two single-qubit operations to encode the local information into the prepared nonmaximally entangled state. Finally, the nonlocal correlations between the two qubits can be directly detected by the joint measurement of the two-qubit register in one of selected computational basis, implemented by probing the steady-state transmitted spectra of the driven cavity. Consequently, the Hardy's ladder proof of nonlocality can be effectively tested. The feasibility of our proposal with the current experimental technology is also analyzed.