All optical quantum information processing via a single step Rydberg blockade gate

Abstract

One of the critical elements in the realization of the quantum internet are deterministic two-photon gates. This $CZ$ photonic gate also completes a set of universal gates for all-optical quantum information processing. This article discusses an approach to realize high fidelity $CZ$ photonic gate by storing both control and target photons within an atomic ensemble using non-Rydberg electromagnetically induced transparency (EIT) followed by a fast, single-step Rydberg excitation with global lasers. The proposed scheme operates by relative intensity modulation of two lasers used in Rydberg excitation. Circumventing the conventional $\pi$-gap-$\pi$ schemes, the proposed operation features continuous laser protection of the Rydberg atoms from the environment noise. The complete spatial overlap of stored photons inside the blockade radius optimizes the optical depth and simplifies the experiment. The coherent operation here is performed in the region that was dissipative in the previous Rydberg EIT schemes. Encountering the main imperfection sources, i.e. the spontaneous emission of the Rydberg and intermediate levels, population rotation errors, Doppler broadening of the transition lines, storage/retrieval efficiency, and atomic thermal motion induced decoherence, this article concludes that with realistic experimental parameters 99.7\% fidelity is achievable.

References in corpus (15)

• The Quantum Internet
• Cooperative atom-light interaction in a blockaded Rydberg ensemble
• Quasiclassical calculations of BBR-induced depopulation rates and effective lifetimes of Rydberg nS, nP and nD alkali-metal atoms with n < 80
• Single Photon Transistor Mediated by Inter-State Rydberg Interaction
• Fidelity of quantum operations
• Single-Photon Transistor Using a Förster Resonance
• Efficient quantum memory for single photon polarization qubits
• Photon storage in Lambda-type optically dense atomic media. II. Free-space model
• Long-range interactions and entanglement of slow single-photon pulses
• Fast multi-qubit gates by adiabatic evolution in interacting excited state manifolds
• Photon-photon gate via the interaction between two collective Rydberg excitations
• Induced cavities for photonic quantum gates
• Discrete-Time Quantum-Walk & Floquet Topological Insulators via Distance-Selective Rydberg-Interaction
• Rydberg Noisy-Dressing and applications in making soliton-molecules and droplet quasi-crystals
• Universal terminal for mobile edge-quantum computing

Cited by in corpus (3)

• High-fidelity and robust controlled-Z gates implemented with Rydberg atoms via echoing rapid adiabatic passage
• Fast multicomponent cat-state generation under resonant or strong-dressing Rydberg-Kerr interaction
• Ultratight confinement of atoms in a Rydberg empowered optical lattice