A trapped-ion experiment realizes measurement-free fault-tolerant logical teleportation, a universal logical gate set, and a three-logical-qubit Grover search, albeit with success below the classical baseline.
Efficient preparation of entangled states in cavity QED with Grover's algorithm
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abstract
We propose to employ the amplification mechanism of Grover's search algorithm to efficiently prepare entangled states of an ensemble of qubits. The conditional change of sign employed in the algorithm can be implemented by the phase shift of photons scattered on an optical cavity hosting an atomic ensemble. We show that collective Dicke states, GHZ states, and Schr\"odinger cat superpositions of $N$ atoms may be prepared deterministically by few ($\sim N^{1/4}$) photon scattering events without individual addressing of the atoms.
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Demonstration of measurement-free universal fault-tolerant quantum computation
A trapped-ion experiment realizes measurement-free fault-tolerant logical teleportation, a universal logical gate set, and a three-logical-qubit Grover search, albeit with success below the classical baseline.