TY - JOUR
T1 - Experimental Detection of Quantum Channel Capacities
AU - Cuevas, Álvaro
AU - Proietti, Massimiliano
AU - Ciampini, Mario Arnolfo
AU - Duranti, Stefano
AU - Mataloni, Paolo
AU - Sacchi, Massimiliano F.
AU - Macchiavello, Chiara
PY - 2017/9/8
Y1 - 2017/9/8
N2 - We present an efficient experimental procedure that certifies nonvanishing quantum capacities for qubit noisy channels. Our method is based on the use of a fixed bipartite entangled state, where the system qubit is sent to the channel input. A particular set of local measurements is performed at the channel output and the ancilla qubit mode, obtaining lower bounds to the quantum capacities for any unknown channel with no need of quantum process tomography. The entangled qubits have a Bell state configuration and are encoded in photon polarization. The lower bounds are found by estimating the Shannon and von Neumann entropies at the output using an optimized basis, whose statistics is obtained by measuring only the three observables σx-σx, σy-σy, and σz-σz.
AB - We present an efficient experimental procedure that certifies nonvanishing quantum capacities for qubit noisy channels. Our method is based on the use of a fixed bipartite entangled state, where the system qubit is sent to the channel input. A particular set of local measurements is performed at the channel output and the ancilla qubit mode, obtaining lower bounds to the quantum capacities for any unknown channel with no need of quantum process tomography. The entangled qubits have a Bell state configuration and are encoded in photon polarization. The lower bounds are found by estimating the Shannon and von Neumann entropies at the output using an optimized basis, whose statistics is obtained by measuring only the three observables σx-σx, σy-σy, and σz-σz.
UR - http://www.scopus.com/inward/record.url?scp=85029581488&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.119.100502
DO - 10.1103/PhysRevLett.119.100502
M3 - Article
C2 - 28949172
AN - SCOPUS:85029581488
VL - 119
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 10
M1 - 100502
ER -