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Sökning: WFRF:(Cabello Adán) > (2020)

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1.
  • Pokorny, Fabian, et al. (författare)
  • Tracking the Dynamics of an Ideal Quantum Measurement
  • 2020
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 124:8
  • Tidskriftsartikel (refereegranskat)abstract
    • The existence of ideal quantum measurements is one of the fundamental predictions of quantum mechanics. In theory, an ideal measurement projects a quantum state onto the eigenbasis of the measurement observable, while preserving coherences between eigenstates that have the same eigenvalue. The question arises whether there are processes in nature that correspond to such ideal quantum measurements and how such processes are dynamically implemented in nature. Here we address this question and present experimental results monitoring the dynamics of a naturally occurring measurement process: the coupling of a trapped ion qutrit to the photon environment. By taking tomographic snapshots during the detection process, we show that the process develops in agreement with the model of an ideal quantum measurement with an average fidelity of 94%.
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2.
  • Smania, Massimiliano, et al. (författare)
  • Experimental certification of an informationally complete quantum measurement in a device-independent protocol
  • 2020
  • Ingår i: Optica. - 2334-2536. ; 7:2, s. 123-128
  • Tidskriftsartikel (refereegranskat)abstract
    • Minimal informationally complete positive operator-valued measures (MIC-POVMs) are special kinds of measurement in quantum theory in which the statistics of their d(2)-outcomes are enough to reconstruct any d-dimensional quantum state. For this reason, MIC-POVMs are referred to as standard measurements for quantum information. Here, we report an experiment with entangled photon pairs that certifies, for what we believe is the first time, a MIC-POVM for qubits following a device-independent protocol (i.e., modeling the state preparation and the measurement devices as black boxes, and using only the statistics of the inputs and outputs). Our certification is achieved under the assumption of freedom of choice, no communication, and fair sampling.
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