Reducing Quantum Errors and Improving Large Scale Quantum Cryptography

Details Reducing Quantum Errors and Improving Large Scale Quantum Cryptography Reducing Quantum Errors and Improving Large Scale Quantum Cryptography

1996-08-15

arxiv.org/abs/quant-ph/9608025v1

Physics

Quantum Physics

5 pages, RevTeX

Scientific paper

Noise causes severe difficulties in implementing quantum computing and quantum cryptography. Several schemes have been suggested to reduce this problem, mainly focusing on quantum computation. Motivated by quantum cryptography, we suggest a coding which uses $N$ quantum bits ($N=n^2$) to encode one quantum bit, and reduces the error exponentially with $n$. Our result suggests the possibility of distributing a secure key over very long distances, and maintaining quantum states for very long times. It also provides a new quantum privacy amplification against a strong adversary.

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