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Award ID contains: 1855174

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  1. ; ; (, Journal of the Optical Society of America B)
    We experimentally demonstrate that we can detect correlated errors in a twin-field quantum key distribution (TFQKD) system by using a technique that is related to self-consistent tomography. We implement a TFQKD system based on a fiber-Sagnac loop, in which Alice and Bob encode information in the phase of weak coherent states that propagate in opposite directions around the loop. These states interfere as they exit the loop and are detected by a third party, Charlie, who reports the results of their measurements to Alice and Bob. We find that it is possible for Alice and Bob to detect correlated state-preparation and measurement errors while trusting only their own individual states, and without trusting Charlie’s measurements. 
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  2. ; ; ; (, Physical Review A)
    null (Ed.)
    Full Text Available 
  3. ; ; (, The Rochester Conference on Coherence and Quantum Optics)
    We describe a technique for simultaneously determining both the state of a quantum system and the positive value operator measure that describes a detector, while making a minimum of assumptions about each of them. 
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    Accepted Manuscript Full Text Available
  4. ; ; ; (, Journal of the Optical Society of America B)
  5. ; ; ; (, Frontiers in Optics 2017)
    We demonstrate that loop state-preparation-and-measurement tomography is capable of detecting nonlocal correlated errors by catching Bob as he tries to fake a Bell-inequality violation while using nonlocal knowledge of Alice’s measurement settings. 
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    Full Text Available