Deterministic generation of a cluster state of entangled photons
Weaving an entangled cluster
Entanglement is a powerful resource for quantum computation and information processing. One requirement is the ability to entangle multiple particles reliably. Schwartz et al. created an on-demand entangled cluster state of several photons by addressing a quantum dot with a sequence of laser pulses (see the Perspective by Briegel). They used an internal state of the quantum dot, a dark exciton, and its association with another internal state, a biexciton, to weave successive photons into an entangled cluster, generating entanglement between up to five photons.
Abstract
Photonic cluster states are a resource for quantum computation based solely on single-photon measurements. 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. 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, and it produces strings of hundreds of photons in which the entanglement persists over five sequential photons. The measured process map characterizing the device has a fidelity of 0.81 with that of an ideal device. Further feasible improvements of this device may reduce the resources needed for optical quantum information processing.
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Supplementary Material
Summary
Materials and Methods
Figs. S1 to S9
Tables S1 and S2
Resources
File (schwartz-sm.pdf)
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Science
Volume 354 | Issue 6311
28 October 2016
28 October 2016
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Copyright © 2016, American Association for the Advancement of Science.
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Submission history
Received: 1 July 2016
Accepted: 30 August 2016
Published in print: 28 October 2016
Acknowledgments
We are grateful to P. Petroff for the sample growth and to T. Rudolph and J. Avron for useful discussions. The support of the Israeli Science Foundation (ISF), the Technion’s RBNI, and the Israeli Nanotechnology Focal Technology Area on Nanophotonics for Detection is gratefully acknowledged. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No 695188). The authors declare that they have no competing financial interests. The relevant data appear in this Research Article and in its supplementary materials.
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