Conditional quantum logic using two atomic qubits

Igor E. Protsenko (1, 2, 3) , Georges Reymond (3) , Nicolas Schlosser (3) , Philippe Grangier (3)

1 JINR - Joint Institute for Nuclear Research
2 LPI RAS - P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow]
3 Laboratoire Charles Fabry de l'Institut d'Optique / Optique quantique

In this paper we propose and analyze a feasible scheme where the detection of a single scattered photon from two trapped atoms or ions performs a conditional unitary operation on two qubits. As examples we consider the preparation of all four Bell states, the reverse operation that is a Bell measurement, and a CNOT gate. We study the effect of atomic motion and multiple scattering, by evaluating Bell inequalities violations, and by calculating the CNOT gate fidelity.

Domaines: Physique Quantique [quant-ph]

Igor E. Protsenko, Georges Reymond, Nicolas Schlosser, Philippe Grangier. Conditional quantum logic using two atomic qubits. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2002, 66(6), pp.062306. ⟨10.1103/PhysRevA.66.062306⟩. ⟨hal-00509112⟩