Demonstration of a programmable source of two-photon multiqubit entangled states

Abstract

We suggest and demonstrate a novel source of two-photon multipartite entangled states which exploits the transverse spatial structure of spontaneous parametric downconversion together with a programmable spatial light modulator (SLM). The 1D SLM is used to perform polarization entanglement purification and to realize arbitrary phase-gates between polarization and momentum degrees of freedom of photons. We experimentally demonstrate our scheme by generating two-photon three qubit linear cluster states with high fidelity using a diode laser pump with a limited coherence time and power on the crystal as low as 2.5$mW.

5 pages, 4 figures, to appear on PRA

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Cited by in corpus (13)

• Experimental investigation of initial system-environment correlations via trace distance evolution
• Minimum tomography of two entangled qutrits using local measurements of one-qutrit SIC-POVM
• Experimental simulation of decoherence in photonics qudits
• Programmable entanglement oscillations in a non Markovian channel
• Two-step procedure to discriminate discordant from classical correlated or factorized states
• Quantum probes to assess correlations in a composite system
• Controlling single-photon Fock-state propagation through opaque scattering materials
• Double-slit implementation of minimal Deutsch algorithm
• Programmable purification of type-I polarization-entanglement
• Nonlocal compensation of pure phase objects with entangled photons
• A novel method to investigate how the spatial correlation of the pump beam affects the purity of polarization entangled states
• Experimental realization of local-to-global noise transition in a two-qubit optical simulator
• Entanglement recovery in noisy binary quantum information protocols via three-qubit quantum error correction codes