Physics Department of the University of Torino is located in Via Pietro Giuria 1 (blue rectangle in Figure 1 below). It is 20 minutes walk or 2 metro stops 
from Torino Porta Nuova, the main train station in the city center (red rectangle).
The closest metro stop to Physics Department is "Nizza" (red ellipse in the map).
Figure 2 is the general map of the metro, with Porta Susa, Porta Nuova and Nizza stops highlighted.
From Torino Porta Nuova train station: take the metro direction Bengasi and get out at the 2nd stop (Nizza). Then exit the metro station following indications for "Corso Raffaello". 10 minutes walk will bring you to the Physics Department.
From Torino Porta Susa train station: Alternatively, if you travel to the other main train station in the city (Torino Porta Susa), you can take the metro direction Bengasi and get out at the 5th stop (Nizza). Then exit the metro station following indications for "Corso Raffaello". 10 minutes walk will bring you to the Physics Department.
By plane
Torino is served by "Sandro Pertini" international airport (TRN). It is located approximately 16 km from the city center.
From the airport there are two possibilities to reach Torino.
Taxi
There are taxis waiting at the Arrival Area of the airport. The travel time from the airport to the city center is 30 minutes with a cost of about 30€.
Taxi Torino phone number: 011 5730 / 011 5737
Bus
It is possible to take the bus to Torino at the Arrival Aerea of the airport. The bus takes about 45 minutes to reach Torino and the ticket price is 7.50€. There are stops at both Torino Porta Nuova and Torino Porta Susa train stations (see above for indications on how to reach Physics Department from there).
All details on the bus are here:
https://www.aeroportoditorino.it/en/tomove/parking-transport/by-bus
By plane flying to Milan
Another possibility is to fly to Milano Malpensa airport (MXP) and reach Torino by bus. In this case the travel time from the airport to Torino is 2h and the ticket price is 22€. Stop in Torino is Autostazione Corso Bolzano, very close to Torino Porta Susa.
Reservation is required for this bus, you can check all details here:
https://torino.arriva.it/en/airport-line-torino-malpensa-airport/
By train
Torino is linked by train to the main italian cities and some european cities. It is convenient to travel to Torino Porta Nuova station, which is fairly close to Physics Department. You can plan your travel by train through Trenitalia website.
As a reference, these are the typical travelling times using the fast train (Frecciarossa) from some of main cities in Italy.
Roma - Torino 4h45'
Milano - Torino 1h
Napoli - Torino 6h
Firenze - Torino 3h
Bologna - Torino 2h20'
Figure 1: map of the area around Physics Department
Figure 2: general map of the metro
