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SUMMARY:Decoherence-assisted quantum key distribution
DTSTART;VALUE=DATE-TIME:20260417T201000Z
DTEND;VALUE=DATE-TIME:20260417T203000Z
DTSTAMP;VALUE=DATE-TIME:20260407T120102Z
UID:indico-contribution-321@fisindico.uniandes.edu.co
DESCRIPTION:Speakers: Alejandra Valencia (Universidad de los Andes)\nIn th
 e development of quantum technologies\, the interaction between a quantum 
 system and its environment\, that leads to decoherence\, is traditionally 
 viewed as a fundamental obstacle. In Quantum Key Distribution (QKD) protoc
 ols like BB84\, environmental noise inevitably degrades state purity\, inc
 reases the Quantum Bit Error Rate (QBER)\, and ultimately compromises the 
 security of the communication channel. \n\nIn this talk\, we challenge thi
 s standard paradigm by presenting a theoretical and experimental study of 
 a controllable decoherence-assisted QKD scheme [1]. Rather than attempting
  to isolate the quantum system from environmental noise\, we demonstrate h
 ow decoherence can be actively harnessed as a tool to enhance security aga
 inst specific eavesdropping strategies\, such as the entangling probe atta
 ck.\n \nWe will discuss our method of introducing tunable decoherence to p
 olarization qubits by coupling them to the spatial degree of freedom of li
 ght. By treating the transverse \nmomentum of the light as a controllable 
 environment\, the sender and receiver (Alice and Bob) can dynamically coor
 dinate and vary the induced dephasing during transmission. When incorporat
 ed into a modified key reconciliation stage\, this shared\, controlled dec
 oherence effectively limits the amount of information an eavesdropper \nca
 n extract.\n\nFinally\, we will share the results of our experimental impl
 ementation\, demonstrating that Alice and Bob can cancel out the dephasing
  effects to recover a low QBER of approximately 7.38%. Ultimately\, this w
 ork adds to the effort of a different perspective on open quantum systems:
  proving that system-environment interactions can be strategically managed
  to our advantage rather than merely mitigated. \n\n[1] Sci. Rep. 15\, 312
 58 (2025).\n\nhttps://fisindico.uniandes.edu.co/event/23/contributions/321
 /
LOCATION:Universidad de los Andes ML-513
URL:https://fisindico.uniandes.edu.co/event/23/contributions/321/
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