Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 56: Focus Session: Quantum Nanophotonics in Solid State Systems II (joint session HL/TT)

TT 56.1: Hauptvortrag

Mittwoch, 14. März 2018, 09:30–10:00, EW 201

The quantum knitting machine: a quantum dot as device for deterministic production of cluster states of many entangled photons — •David Gershoni — The Physics Department and The Solid State Institute, Technion, Haifa, 32000, Israel

Photonic cluster states are a resource for quantum computation based solely on single-photon measurements [1]. We use semiconductor quantum dots to deterministically generate long strings of polarization-entangled photons in a cluster state by periodic timed excitation of a precessing matter qubit [1-2]. In each period, an entangled photon is added to the cluster state formed by the matter qubit and the previously emitted photons. In our prototype device, the qubit is the confined dark exciton [3,4], and it produces strings of hundreds of photons in which the entanglement persists over five sequential photons [5]

[1] H. J. Briegel, "Versatile cluster entangled light", Science 354, 416 (2016)

[2] N. H. Lindner and T. Rudolph, "Proposal for pulsed on-demand sources of photonic cluster state strings", Phys. Rev. Lett. 103, 113602 (2009)

[3] E.Poem, et al, "Accessing the dark exciton with light", Nature Physics 6, 993, (2010)

[4] I. Schwartz, et al, "Deterministic writing and control of the dark exciton spin using short single optical pulses", Phys. Rev. X 5, 011009 (2015)

[5] I. Schwartz, et al, "Deterministic generation of a cluster state of entangled photons", Science 354, 434, (2016)