Deutsch, Toffoli, and cnot Gates via Rydberg Blockade of Neutral Atoms
Abstract
Universal quantum gates and quantum error correction (QEC) lie at the heart of quantuminformation science. Largescale quantum computing depends on a universal set of quantum gates, in which some gates may be easily carried out, while others are restricted to certain physical systems. There is a unique threequbit quantum gate called the Deutsch gate [D (θ )], from which a circuit can be constructed so that any feasible quantum computing is attainable. We design an easily realizable D (θ ) by using the Rydberg blockade of neutral atoms, where θ can be tuned to any value in [0 ,π ] by adjusting the strengths of external control fields. Using similar protocols, we further show that both the Toffoli and controllednot gates can be achieved with only three laser pulses. The Toffoli gate, being universal for classical reversible computing, is also useful for QEC, which plays an important role in quantum communication and faulttolerant quantum computation. The possibility and speed of realizing these gates shed light on the study of quantum information with neutral atoms.
 Publication:

Physical Review Applied
 Pub Date:
 May 2018
 DOI:
 10.1103/PhysRevApplied.9.051001
 arXiv:
 arXiv:1710.01859
 Bibcode:
 2018PhRvP...9e1001S
 Keywords:

 Quantum Physics
 EPrint:
 Letter &