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Scientific Report 2007-2009<br />
Laboratories and Facilities of the Department of Physics<br />
L1. Quantum Optics Lab<br />
The Quantum Optics laboratory has been<br />
engaged in experimental and theoretical researches<br />
on quantum information since almost<br />
15 years. The group has contributed for<br />
many years to the quantum optics field with<br />
relevant experiments in ultrafast mode-locked<br />
and free-electron laser physics, QED microcavity<br />
physics, basic quantum interferometry<br />
and non-linear solid-state and molecular spec-<br />
Figure 1: Schematic representation of the multiqubit source based on<br />
multipath entanglement [2].<br />
troscopy. This advanced know-how on linear<br />
and non-linear optics has been recently applied<br />
to several quantum information tasks: quantum<br />
teleportation, since the first realization in<br />
Rome to the implementation of active teleportation<br />
protocol and of teleportation of a quantum<br />
gate, optimal quantum cloning and U-Not<br />
gate, quantum process and state tomography,<br />
generation and detection of entanglement, amplification<br />
and purification of single qubits, frequency<br />
hopping of a single photon, generation of 2-photon hyper-entangled and cluster states, realization of polarization<br />
qutrits, implementation of the minimal disturbing measurement, manipulation of orbital angular momentum,<br />
generation of multiphoton entangled states.<br />
The laboratory in Roma is equipped with four optical experiments running independently. A first experimental<br />
activity is aimed at the generation of entangled states with large number of photons. The main optical source is a<br />
femtosecond laser (MIRA from Coherent) pumped by a 10W duplicated Nd:YAG laser (VERDI) further amplified<br />
by a regenerative amplifier (REGA from Coherent) pumped by a 18W Verdi.<br />
The output field achieves an average power equal to 1.5<br />
W, the repetition rate is 250 kHz and the pulse duration<br />
is equal to 250 fs. The second research activity is devoted<br />
to the generation and manipulation of multi qubit hypercluster<br />
entangled states and adopts a CW Argon laser and a<br />
femtosecond laser (MIRA from coherent pumped by a 10W<br />
Verdi).<br />
A parallel third topic addresses the manipulation of orbital<br />
angular momentum, the main source is the second harmonic<br />
of a femtosecond laser (MIRA from Coherent pumped by a<br />
10W Verdi). The achieved power is equal to 750 mW, the<br />
Figure 2: Schematic representation of the multiqubit repetition rate is 76 MHz and the pulse duration is equal<br />
source based on multipath entanglement [2]. to about 180 fs.<br />
The last research line concerns the generation of multipath and time-energy entangled state and integrated<br />
quantum circuits. It is based on a duplicated 2W Verdi laser (MBD266 from Coherent) delivering a single mode<br />
beam at 266 nm with power of 200 mW. A CW diode laser emitting 50 mW at 403 nm completes the available<br />
sources. All the experimental apparatus are based on nonlinear crystals, single-photon detectors, bulk and fiber<br />
optics elements, polarization manipulation, photomultipliers.<br />
http://quantumoptics.phys.uniroma1.it/<br />
Related research activities: C43, C45.<br />
<strong>Sapienza</strong> Università di Roma 176 Dipartimento di Fisica
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