2012/01/20 by Mustafa Gündoğan, Patrick M. Ledingham, Attaallah Almasi +2 · 6 citations
Computer Science · Physics and Astronomy · #Atomic and Subatomic Physics Research #Charge qubit #Computer data storage #Computer science #Flux qubit #Phase qubit #Photon #Physics #Polarization (electrochemistry) #Quantum #Quantum Information and Cryptography #Quantum computer #Quantum entanglement #Quantum information #Quantum information science #Quantum mechanics #Quantum optics and atomic interactions #Quantum state #Qubit #quant-ph
paper · pdf · doi:10.1103/physrevlett.108.190504
published as Phys. Rev. Lett. 108, 190504 (2012) · 6 pages, 6 figures, 1 table. New reference added
arxiv created 2012/01/20 · openalex publication_date 2012/05/10 · arxiv updated 2012/08/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report on the quantum storage and retrieval of photonic polarization quantum bits onto and out of a solid state storage device. The qubits are implemented with weak coherent states at the single photon level, and are stored for a predetermined time of 500 ns in a praseodymium doped crystal with a storage and retrieval efficiency of 10%, using the atomic frequency comb scheme. We characterize the storage by using quantum state tomography, and find that the average conditional fidelity of the retrieved qubits exceeds 95% for a mean photon number μ=0.4. This is significantly higher than a classical benchmark, taking into account the poissonian statistics and finite memory efficiency, which proves that our crystal functions as a quantum storage device for polarization qubits. These results extend the storage capabilities of solid state quantum light matter interfaces to polarization encoding, which is widely used in quantum information science.