# Testing Hardy’s ladder proof of nonlocality by joint measurements of qubits

Testing Hardy’s ladder proof of nonlocality by joint measurements of qubits 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 ⟩ , 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

# Testing Hardy’s ladder proof of nonlocality by joint measurements of qubits

, Volume 12 (10) – Jun 23, 2013
12 pages

Publisher
Springer US
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-013-0602-0
Publisher site
See Article on Publisher Site

### References

• Can quantum-mechanical description of physical reality be considered complete?
Eistein, A; Podolsky, B; Rosen, N
• Nonlocality of cluster states of qubits
Scarani, V; Acin, A; Schenck, E; Aspelmeyer, M
• Testing Hardy’s nonlocality proof with genuine energy-time entanglement
Vallone, G; Gianani, I; Inostroza, EB; Saavedra, C; Lima, G; Cabello, A; Mataloni, P

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