Storage of polarization-entangled THz-bandwidth photons in a diamond quantum memory

Abstract

Bulk diamond phonons have been shown to be a versatile platform for the generation, storage, and manipulation of high-bandwidth quantum states of light. Here we demonstrate a diamond quantum memory that stores, and releases on demand, an arbitrarily polarized $\sim$250 fs duration photonic qubit. The single-mode nature of the memory is overcome by mapping the two degrees of polarization of the qubit, via Raman transitions, onto two spatially distinct optical phonon modes located in the same diamond crystal. The two modes are coherently recombined upon retrieval and quantum process tomography confirms that the memory faithfully reproduces the input state with average fidelity $0.784\pm 0.004$ with a total memory efficiency of $(0.76\pm 0.03)\%$. In an additional demonstration, one photon of a polarization-entangled pair is stored in the memory. We report that entanglement persists in the retrieved state for up to 1.3 ps of storage time. These results demonstrate that the diamond phonon platform can be used in concert with polarization qubits, a key requirement for polarization-encoded photonic processing.

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• Non-Gaussian mechanical motion via single and multi-phonon subtraction from a thermal state
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• Two-mode Schrödinger-cat states with nonlinear optomechanics: generation and verification of non-Gaussian mechanical entanglement
• Bell correlations between light and vibration at ambient conditions
• Optimization of Broadband $\Lambda$-type Quantum Memory Using Gaussian Pulses
• Experimental storage of photonic polarization entanglement in a broadband loop-based quantum memory
• Measurement-Induced Collective Vibrational Quantum Coherence under Spontaneous Raman Scattering in a Liquid
• Second-Order Coherence Across the Brillouin Lasing Threshold
• Broadband Quantum Memory in Atomic Ensembles
• Effective Hamiltonian for Stokes--anti-Stokes pair generation with pump and probe polarized modes
• Interaction of a heralded single photon with nitrogen-vacancy centers in a diamond
• Variance-Based Sensitivity Analysis of $\Lambda$-type Quantum Memory