A quantum memory for orbital angular momentum photonic qubits

By A. Nicolas, L. Veissier, L. Giner, Elisabeth Giacobino, D. Maxein, Julien Laurat. Nature Photonics, 2013

443 citations recorded by the source corpus.

Among the optical degrees of freedom, the orbital angular momentum of light1 provides unique properties2, including mechanical torque action, which has applications for light manipulation3, enhanced sensitivity in imaging techniques4 and potential high-density information coding for optical communication systems5. Recent years have also seen a tremendous interest in exploiting orbital angular momentum at the single-photon level in quantum information technologies6,7. In pursuing this endeavour, we demonstrate here the implementation of a quantum memory8 for quantum bits encoded in this optical degree of freedom. We generate various qubits with computer-controlled holograms, store and retrieve them on demand using a dynamic electromagnetically induced transparency protocol. We further analyse the retrieved states by quantum tomography and thereby demonstrate fidelities exceeding the classical benchmark, confirming the quantum functioning of our storage process. Our results provide an essential capability for future networks9 exploring the promises of orbital angular momentum of photons for quantum information applications. A quantum memory for orbital angular momentum qubits is demonstrated in the single-photon regime. It is based on cold cesium atoms and the dynamic electromagnetically induced transparency protocol. Retrieved states were analysed by quantum tomography, and fidelities after readout of over 92% were obtained, confirming the quantum functionality of the storage process.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/2a4042b71876423d264ceff42ac7687e93c57628

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Citations in the corpus

Quantum memories: emerging applications and recent advances (2015, unknown): “um MOT using EIT [106]. Using the same system, qubit storage and retrieval was demonstrated for coherent states with mean photon number n= 0:6, a raw average delity of 92:5 2%, and eciency = 15 2% [107]. More recently, the same group was able to store and retrieve vector beams { characterized by var”
Robust Encoding of a Qubit in a Molecule (2019, background): “Other possibilities include the phase difference between two superconductors on either side of a Josephson junction [121], orbital angular momentum of light [122], or simulating rotor position states using phase states of an ordinary oscillator [123].”