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Articles by D. Englund
Experimental quantum speed-up in reinforcement learning agents
Abstract As the field of artificial intelligence advances, the demand for algorithms that can learn quickly and efficiently increases. An important paradigm within artificial intelligence is reinforcement learning1, where decision-making entities called agents interact with environments and learn by updating their behaviour on the basis of the obtained feedback. The crucial question for practical applications is how fast agents learn2.
A polarization encoded photon-to-spin interface
Abstract We propose an integrated photonics device for mapping qubits encoded in the polarization of a photon onto the spin state of a solid-state defect coupled to a photonic crystal cavity: a “polarization-encoded photon-to-spin interface” (PEPSI). We perform a theoretical analysis of the state fidelity’s dependence on the device’s polarization extinction ratio and atom–cavity cooperativity. Furthermore, we explore the rate-fidelity trade-off through analytical and numerical models.
Advances in quantum cryptography
S. Bäuml, K. Azuma, G. Kato, and D. Elkouss, “Linear programs for entanglement and key distribution in the quantum internet,” Commun. Phys. 355 (2020). [Crossref] S. Pirandola, “General upper bounds for distributing conferencing keys in arbitrary quantum networks,” IET Quantum Commun. 1, 22–25 (2020). [Crossref] P. J. Brown, S. Ragy, and R. Colbeck, “A framework for quantum-secure device-independent randomness expansion,” IEEE Trans. Inf. Theory 66, 2964–2987 (2020). [Crossref] Y. Zhang, H. Fu, and E.
Experimental demonstration of memory-enhanced quantum communication
Abstract The ability to communicate quantum information over long distances is of central importance in quantum science and engineering1. Although some applications of quantum communication such as secure quantum key distribution2,3 are already being successfully deployed4,5,6,7, their range is currently limited by photon losses and cannot be extended using straightforward measure-and-repeat strategies without compromising unconditional security8.
Trace-free counterfactual communication with a nanophotonic processor
Abstract In standard communication information is carried by particles or waves. Counterintuitively, in counterfactual communication particles and information can travel in opposite directions. The quantum Zeno effect allows Bob to transmit a message to Alice by encoding information in particles he never interacts with. A first remarkable protocol for counterfactual communication relied on thousands of ideal optical operations for high success rate performance.
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