Experimental detection of quantum channel capacities

Abstract

We present an effcient experimental procedure that certifies non vanishing 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 a 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 ${\sigma }_x\otimes {\sigma }_x$, ${\sigma }_y\otimes {\sigma }_y$ and ${\sigma }_z\otimes {\sigma }_z$.

5 pages and 3 figures in the principal article, and 4 pages in the supplementary material

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Cited by in corpus (22)

• Experimental Quantum Communication Enhancement by Superposing Trajectories
• Entanglement-Assisted Communication Surpassing the Ultimate Classical Capacity
• Tuning quantum channels to maximize polarization entanglement for telecom photon pairs
• Generation of quantum states with nonlinear squeezing by Kerr nonlinearity
• Convex approximations of quantum channels
• A variable partially-polarizing beam splitter
• Exploring classical correlations in noise to recover quantum information using local filtering
• Optimal entanglement witnesses from limited local measurements
• Experimental observation of coherent-information superadditivity in a dephrasure channel
• Entanglement catalysis for quantum states and noisy channels
• Efficient accessible bounds to the classical capacity of quantum channels
• Experimental witnessing of the quantum channel capacity in the presence of correlated noise
• The Transfer of Entanglement Negativity at the Onset of Interactions
• Mixed-state certification of quantum capacities for noisy communication channels
• Experimental Lower Bounds to the Classical Capacity of Quantum Channels
• Detection of properties and capacities of quantum channels
• Bounding the Classical Capacity of Multilevel Damping Quantum Channels
• Transmission of coherent information at the onset of interactions
• Detecting Quantum Capacities of Continuous-Variable Quantum Channels
• Experimental protocol for qubit-environment entanglement detection
• Detecting Markovianity of Quantum Processes via Recurrent Neural Networks
• All-optical implementation of collision-based evolutions of open quantum systems