Quantum and optical technology

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Fisher information for far-field linear optical superresolution via homodyne or heterodyne detection in a higher-order local oscillator mode

(2017)

Authors:

Fan Yang, Ranjith Nair, Mankei Tsang, Christoph Simon, Alexander I Lvovsky

Enlargement of optical Schr枚dinger's cat states

Nature Photonics Springer Nature 11:6 (2017) 379-382

Authors:

Demid V Sychev, Alexander E Ulanov, Anastasia A Pushkina, Matthew W Richards, Ilya A Fedorov, Alexander I Lvovsky

Quantum-secured blockchain

(2017)

Authors:

EO Kiktenko, NO Pozhar, MN Anufriev, AS Trushechkin, RR Yunusov, YV Kurochkin, AI Lvovsky, AK Fedorov

Bright narrowband biphoton generation from a hot rubidium atomic vapor cell

Applied Physics Letters AIP Publishing 110:16 (2017) 161101-161101

Authors:

Lingbang Zhu, Xianxin Guo, Chi Shu, Heejeong Jeong, Shengwang Du

Quantum teleportation between discrete and continuous encodings of an optical qubit

Physical Review Letters American Physical Society 118:16 (2017) 160501

Authors:

Alexander E Ulanov, Demid Sychev, Anastasia A Pushkina, Ilya A Fedorov, AI Lvovsky

Abstract:

The transfer of quantum information between physical systems of a different nature is a central matter in quantum technologies. Particularly challenging is the transfer between discrete and continuous degrees of freedom of various harmonic oscillator systems. Here we implement a protocol for teleporting a continuous-variable optical qubit, encoded by means of low-amplitude coherent states, onto a discrete-variable, single-rail qubit鈥攁 superposition of the vacuum and single-photon optical states鈥攙ia a hybrid entangled resource. We test our protocol on a one-dimensional manifold of the input qubit space and demonstrate the mapping onto the equator of the teleported qubit鈥檚 Bloch sphere with an average fidelity of 0.83卤0.04. Our work opens up the way to the wide application of quantum information processing techniques where discrete- and continuous-variable encodings are combined within the same optical circuit.