Scalable quantum information processing with atomic ensembles and flying photons

Abstract

We present a scheme for scalable quantum information processing (QIP) with atomic ensembles and flying photons. Using the Rydberg blockade, we encode the qubits in the collective atomic states, which could be manipulated fast and easily due to the enhanced interaction, in comparison to the single-atom case. We demonstrate that our proposed gating could be applied to generation of two-dimensional cluster states for measurement-based quantum computation. Moreover, the atomic ensembles also function as quantum repeaters useful for long distance quantum state transfer. We show the possibility of our scheme to work in bad cavity or in weak coupling regime, which could much relax the experimental requirement. The efficient coherent operations on the ensemble qubits enable our scheme to be switchable between quantum computation and quantum communication using atomic ensembles.

8 pages, 7 figures

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• Efficient construction of 2-D cluster states with probabilistic quantum gates
• Many-qubit network employing cavity QED in a decoherence-free subspace
• High-efficiency cluster-state generation with atomic ensembles via the dipole-blockade mechanism

Cited by in corpus (11)

• Quantum information with Rydberg atoms
• Quantum entanglement distribution with hybrid parity gate
• Strong tunable spin-spin interaction in a weakly coupled nitrogen vacancy spin-cavity electromechanical system
• Heralded high-efficiency quantum repeater with atomic ensembles assisted by faithful single-photon transmission
• Entanglement distillation for quantum communication network with atomic-ensemble memories
• Deterministic generation of multiparticle entanglement in a coupled cavity-fiber system
• Multiple single-photon generations in three-level atoms coupled to cavity with non-Markovian effects
• Controlling Frequency-Domain Hong-Ou-Mandel Interference via Electromagnetically Induced Transparency
• Proposal of ensemble qubits with two-atom decay
• Topological quantum walks in cavity-based quantum networks
• Universal quantum gates for photon-atom hybrid systems assisted by bad cavities