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Quantum data gathering Public Deposited

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  • Measurement of a quantum system - the process by which an observer gathers information about it - provides a link between the quantum and classical worlds. The nature of this process is the central issue for attempts to reconcile quantum and classical descriptions of physical processes. Here, we show that the conventional paradigm of quantum measurement is directly responsible for a well-known disparity between the resources required to extract information from quantum and classical systems. We introduce a simple form of quantum data gathering, "coherent measurement", that eliminates this disparity and restores a pleasing symmetry between classical and quantum statistical inference. To illustrate the power of quantum data gathering, we demonstrate that coherent measurements are optimal and strictly more powerful than conventional one-at-a-time measurements for the task of discriminating quantum states, including certain entangled many-body states (e.g., matrix product states).
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  • Blume-Kohout, R., Croke, S., & Zwolak, M. (2013). Quantum data gathering. Scientific Reports, 3, 1800. doi:10.1038/srep01800
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  • This work was supported by the US Department of Energy through the LANL/LDRD program (RBK and MPZ), as well as by Perimeter Institute for Theoretical Physics (RBK and SC). Research at Perimeter Institute is supported by the Government of Canada through Industry Canada and by the Province of Ontario through the Ministry of Research & Innovation.
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  • description.provenance : Made available in DSpace on 2013-07-01T17:27:45Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) ZwolakMichaelPhysicsQuantumDataGathering.pdf: 451687 bytes, checksum: da6ec8cbea673e280d4a5dd4ee50cd08 (MD5) Previous issue date: 2013-05-14
  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2013-07-01T17:27:05Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) ZwolakMichaelPhysicsQuantumDataGathering.pdf: 451687 bytes, checksum: da6ec8cbea673e280d4a5dd4ee50cd08 (MD5)
  • description.provenance : Approved for entry into archive by Deborah Campbell(deborah.campbell@oregonstate.edu) on 2013-07-01T17:27:45Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) ZwolakMichaelPhysicsQuantumDataGathering.pdf: 451687 bytes, checksum: da6ec8cbea673e280d4a5dd4ee50cd08 (MD5)

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