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Time-Entanglement QKD: Secret Key Rates and Information Reconciliation Coding | | Joseph J. Boutros
; Emina Soljanin
; | | Date: |
1 Jan 2023 | | Abstract: | In time entanglement-based quantum key distribution (QKD), Alice and Bob
extract the raw key bits from the (identical) arrival times of entangled photon
pairs by time-binning. Each of them individually discretizes time into bins and
groups them into frames. They retain only the frames with a single occupied
bin. Thus, Alice and Bob can use the position of the occupied bin within a
frame to generate random key bits, as in PPM modulation. Because of
entanglement, their occupied bins and their keys should be identical. However,
practical photon detectors suffer from time jitter errors. These errors cause
discrepancies between Alice’s and Bob’s keys. Alice sends information to Bob
through the public channel to reconcile the keys. The amount of information
determines the secret key rate. This paper computes the secret key rates
possible with detector jitter errors and constructs codes for information
reconciliation to approach these rates. | | Source: | arXiv, 2301.00486 | | Services: | Forum | Review | PDF | Favorites | |
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