Journal
PHYSICAL REVIEW A
Volume 91, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.91.062301
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Funding
- U.S. Office of Naval Research
- Industry Canada
- CFI
- Ontario MRI
- NSERC
- Canadian Space Agency
- CryptoWorks21
- FED DEV
- Thai DPST
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In free-space quantum key distribution (QKD), the sensitivity of the receiver's detector channels may depend differently on the spatial mode of incoming photons. Consequently, an attacker can control the spatial mode to break security. We experimentally investigate a standard polarization QKD receiver and identify sources of efficiency mismatch in its optical scheme. We model a practical intercept-and-resend attack and show that it would break security in most situations. We show experimentally that adding an appropriately chosen spatial filter at the receiver's entrance may be an effective countermeasure.
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