A faithful solid-state spin-wave quantum memory for polarization qubits

Abstract

Polarization-encoded qubits are particularly useful in quantum information tasks due to the easy transportation in a single spatial and temporal mode, the accurate qubit manipulation and the high robustness against decoherence. Reliable storage of polarization-encoded qubits is essential for the construction of large-scale quantum networks. Here we demonstrate a faithful quantum memory for photonic polarization qubits using the noiseless photon echo protocol implemented in a rare-earth-ion doped crystal (151Eu3+:Y2SiO5). Based on a detailed spectroscopic investigation on the 151Eu3+ ions at the site 2 of Y2SiO5 crystals, the qubit memory is implemented using a single piece of crystal which provides a near-uniform absorption for two orthogonal polarization states. A process fidelity of 0.919(24) is obtained for the storage of qubits carried by single-photon-level coherent pulses, which is beyond the maximal fidelity that can be achieved using the classical measure-and-prepare strategy. This compact device shall provide a useful solution for the construction of a long-lived transportable quantum memory and the memory-based quantum networks.

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Cited by in corpus (4)

• On-demand Integrated Quantum Memory for Polarization Qubits
• A millisecond integrated quantum memory for photonic qubits
• Coherent optical-microwave interface for manipulation of low-field electronic clock transitions in ${}^{171}$Yb${}^{3+}$:Y${}_2$SiO${}_5$
• Quantum networks using rare-earth ions