Temporal compression of quantum information-carrying photons using a photon-echo quantum memory approach

Abstract

We study quantum compression and decompression of light pulses that carry quantum information using a photon-echo quantum memory technique with controllable inhomogeneous broadening of an isolated atomic absorption line. We investigate media with differently broadened absorption profiles, transverse and longitudinal, finding that the recall efficiency can be as large as unity and that the quantum information encoded into the photonic qubits can remain unperturbed. Our results provide new insight into reversible light-atom interaction, and are interesting in view of future quantum communication networks, where pulse compression and decompression may play an important role to increase the qubit rate, or to map quantum information from photonic carriers with large optical bandwidth into atomic memories with smaller bandwidth.

20 pages, 10 figures

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• Photon echo quantum memory with complete use of natural inhomogeneous broadening
• Scalable time reversal of Raman echo quantum memory and quantum waveform conversion of light pulse
• Spectral broadening and shaping of nanosecond pulses: towards shaping of single photons from quantum emitters
• Pulse area theorem in a single mode waveguide and its application to photon echo and optical memory in Tm3+:Y3Al5O12
• Storage and manipulation of single x-ray photons via nuclear hyperfine splitting