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Scientific Report 2007-2009 Laboratories and Facilities of the Department of Physics Laboratories and Facilities of the Department of Physics Laboratories L1. Quantum Optics Lab L2. Cell Biophysics Lab L3. Bio Macromol Lab L4. LOTUS (LOw Temperature Ultarviolet photoelectron Spectroscopy) Laboratory L5. Infrared Spectroscopy Lab L6. Laboratory on ”Nanomaterials for alternative energies: solid-state hydrogen storage” L7. Nuclear Magnetic Resonance (NMR) Laboratory L8. DECA NMR Laboratory L9. Semiconductors and Optical Properties of Solids Lab L10. Holographic Micromanipulation and Microscopy Lab L11. Photon Correlation Lab L12. High Pressure Spectroscopy Lab L13. Inhomogenoeus and Correlated Functional Materials and Quantum Phenomena in Condensed Matter Lab L14. Laboratory for Ultrafast Spectroscopy L15. Macroscopic Quantum Coherence Lab L16. Electronics and Silicon detectors Lab L17. SCILab L18. The Gravitational Wave laboratory VIRGO L19. Laboratory of the KLOE-ROMA group L20. The ATLAS-KLOE-DREAM laboratory L21. Nuclear Emulsion Scanning Lab L22. High Energy Astrophysical Neutrino Detection Laboratory L23. Experimental Cosmology Lab L24. Millimeter and Infrared Testagrigia Observatory L25. Solar Radiometry Observatory L26. The Vallinfreda astronomical Station L27. Atmospheric Physics Lab Facilities F1. Departmental Library F2. APE Laboratory F3. The Tier2 Computing Centre for LHC F4. The Electronics Lab LABE <strong>Sapienza</strong> Università di Roma 175 Dipartimento di Fisica
Scientific Report 2007-2009 Laboratories and Facilities of the Department of Physics L1. Quantum Optics Lab The Quantum Optics laboratory has been engaged in experimental and theoretical researches on quantum information since almost 15 years. The group has contributed for many years to the quantum optics field with relevant experiments in ultrafast mode-locked and free-electron laser physics, QED microcavity physics, basic quantum interferometry and non-linear solid-state and molecular spec- Figure 1: Schematic representation of the multiqubit source based on multipath entanglement [2]. troscopy. This advanced know-how on linear and non-linear optics has been recently applied to several quantum information tasks: quantum teleportation, since the first realization in Rome to the implementation of active teleportation protocol and of teleportation of a quantum gate, optimal quantum cloning and U-Not gate, quantum process and state tomography, generation and detection of entanglement, amplification and purification of single qubits, frequency hopping of a single photon, generation of 2-photon hyper-entangled and cluster states, realization of polarization qutrits, implementation of the minimal disturbing measurement, manipulation of orbital angular momentum, generation of multiphoton entangled states. The laboratory in Roma is equipped with four optical experiments running independently. A first experimental activity is aimed at the generation of entangled states with large number of photons. The main optical source is a femtosecond laser (MIRA from Coherent) pumped by a 10W duplicated Nd:YAG laser (VERDI) further amplified by a regenerative amplifier (REGA from Coherent) pumped by a 18W Verdi. The output field achieves an average power equal to 1.5 W, the repetition rate is 250 kHz and the pulse duration is equal to 250 fs. The second research activity is devoted to the generation and manipulation of multi qubit hypercluster entangled states and adopts a CW Argon laser and a femtosecond laser (MIRA from coherent pumped by a 10W Verdi). A parallel third topic addresses the manipulation of orbital angular momentum, the main source is the second harmonic of a femtosecond laser (MIRA from Coherent pumped by a 10W Verdi). The achieved power is equal to 750 mW, the Figure 2: Schematic representation of the multiqubit repetition rate is 76 MHz and the pulse duration is equal source based on multipath entanglement [2]. to about 180 fs. The last research line concerns the generation of multipath and time-energy entangled state and integrated quantum circuits. It is based on a duplicated 2W Verdi laser (MBD266 from Coherent) delivering a single mode beam at 266 nm with power of 200 mW. A CW diode laser emitting 50 mW at 403 nm completes the available sources. All the experimental apparatus are based on nonlinear crystals, single-photon detectors, bulk and fiber optics elements, polarization manipulation, photomultipliers. http://quantumoptics.phys.uniroma1.it/ Related research activities: C43, C45. <strong>Sapienza</strong> Università di Roma 176 Dipartimento di Fisica
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