• ABSTRACT – FUTURE QUANTUM COMPLEX NETWORKS: Q- INTERNET AND Q-TELEPORTATION

Complex networks between distant parties are ubiquitous nowadays and that will not be different in the development of future quantum technologies, most notably those based on Bell”s theorem. By adopting a photonic setup we implemented a quantum network between three distant nodes whose correlations are mediated by two independent sources of entanglement. By employing human randomness, we violated a Bell inequality that allow us to witness the emergence of a new kind of non-local correlations in this complex scenario. 

• FACTS
  • Yesterday evening we had a crash of the computer: we had to update all the software to control the different liquid crystals. But finally at 23:30 of 29 November we were again ready to go!
  • Last week we decided to upgrade the apparatus from motorized waveplates to liquid crystals in order to enhance the overall rate of our experiments.
  • In the Quantum Information Lab in Rome, 10000 double pairs of entangled photons are generated every second.

 

• QUOTE

“With almost the same setup, the Quantum Information Lab in Rome performed and studied quantum teleportation with a new approach two weeks ago. This is a joint project with Daniel Cavalcanti and coworkers from ICFO.”

1. Name of lab:

Quantum Lab

2. Team:

Luca Santodonato, Gonzalo Carvacho, Francesco Andreoli , Marco Bentivegna, RafaelChaves, and Fabio Sciarrino (PI).

3. Organization:

Quantum Information Lab, Dipartimento di Fisica – Sapienza Università diRomaInternational Institute of Physics, FederalUniversity of Rio Grande do Norte

4. City:

Rome

5. GPS coordinates of the experiment:

Latitude 41.9016462 I Longitude= 12.515863200000013

6. Name of experiment:

Experimental bilocality violation with human randomness7.- Target Bell inequality and experimental result obtained:CASBCS (Carvacho-Andreoli-Santodonato-Bentivegna-Chaves-Sciarrino) bilocality inequality as in Cavarcho et al.: local realism implies |B|≤1. We obtain a value for B of 1.225±0.007, which corresponds to a violation of the inequality by more than 32 standard deviations.

8. What did the experiment test?

Quantum non-bilocality in complex networks exploiting human randomness.

9. Physical system used:

Photons.

10. Degree of freedom measured:

Polarization.

11. Rate of bits consumed & total number of bits:

Estimated 0.62 bps (bits per second), which amounts to a total of 22440 bits.

12. What was the use of the bits of the Bellsters?

We use the bits for the selection of the measurement choice which was completely driven by the Bellsters. The bits change the voltage of liquid crystals in order to change between two different measurement settings.

13. How long did the experiment took?

We performed the experiment in two runs: from 00:00 to 9 am and then from 10 am to 16 pm CET.

14. Did you use all the bits in real time?

Yes.

15. Distance between Alice and Bob:

EPR1-ALICE= 55 cmEPR1-BOB= 120 cmEPR1-CHARLIE= 80 cmEPR1-EPR2= 50 cmEPR2-ALICE= 75 cmEPR2-BOB= 150 cmEPR2-CHARLIE= 60 cmALICE-BOB= 85 cmALICE-CHARLIE= 60cmBOB-CHARLIE= 130 cm