Abstract
It is known that the maximum classical mutual information that can be achieved between measurements on a pair of quantum systems can drastically underestimate the quantum mutual information between those systems. In this article, we quantify this distinction between classical and quantum information by demonstrating that after removing a logarithmic-sized quantum system from one half of a pair of perfectly correlated bitstrings, even the most sensitive pair of measurements might only yield outcomes essentially independent of each other. This effect is a form of information locking but the definition we use is strictly stronger than those used previously. Moreover, we find that this property is generic, in the sense that it occurs when removing a random subsystem. As such, the effect might be relevant to statistical mechanics or black hole physics. Previous work on information locking had always assumed a uniform message. In this article, we assume only a min-entropy bound on the message and also explore the effect of entanglement. We find that classical information is strongly locked almost until it can be completely decoded. As a cryptographic application of these results, we exhibit a quantum key distribution protocol that is “secure” if the eavesdropper’s information about the secret key is measured using the accessible information but in which leakage of even a logarithmic number of key bits compromises the secrecy of all the others.
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References
Aharonov, Y., Casher, A., Nussinov, S.: The unitarity puzzle and Planck mass stable particles. Phys. Lett. B 191, 51–55 (1987)
Abeyesinghe, A., Devetak, I., Hayden, P., Winter, A.: The mother of all protocols: Restructuring quantum information’s family tree. In: Proceedings of the Royal Society A, vol. 465, pp. 2537–2563 (2009). quant-ph/0606225
Alicki, R., Fannes, M.: Continuity of quantum mutual information. J. Phys. A. Math. Gen. 37(5), L55–L57 (2004). quant-ph/0312081
Buhrman, H., Christandl, M., Hayden, P., Lo, H.-K., Wehner, S.: Security of quantum bit string commitment depends on the information measure. Phys. Rev. Lett. 97, 250501 (2006). arXiv:quant-ph/0609237
Buhrman, H., Christandl, M., Hayden, P., Lo, H.-K., Wehner, S.: Possibility, impossibility, and cheat-sensitivity of quantum bit string commitment. Phys. Rev. A. 78, 022316 (2008). arXiv:quant-ph/0504078
Blume-Kohout, R., Zurek, W.H.: Quantum Darwinism: entanglement, branches, and the emergence of classicality of redundantly stored quantum information. Phys. Rev. A 73, 062310 (2006)
Ben-Or, M., Horodecki, M., Leung, D.W., Mayers, D., Oppenheim, J.: The universal composable security of quantum key distribution. In: Kilian, J. (ed.) TCC 2005. LNCS, vol. 3378, pp. 386–406. Springer, Heidelberg (2005)
Braunstein, S.L., Sommers, H.J., Zyczkowski, K.: Entangled black holes as ciphers of hidden information (2009). arXiv:0907.0739
Carlitz, R.D., Willey, R.S.: Lifetime of a black hole. Phys. Rev. D 36, 2336–2341 (1987)
Dupuis, F., Florjanczyk, J., Hayden, P., Leung, D.: Locking classical information (2010). arXiv:1011.1612
DiVincenzo, D.P., Horodecki, M., Leung, D.W., Smolin, J.A., Terhal, B.M.: Locking classical correlation in quantum state. Phys. Rev. Lett. 92, 067902 (2004). quant-ph/0303088
Fawzi, O., Hayden, P., Sen, P.: From low-distortion embeddings to metric uncertainty relations and information locking (2010). arXiv:1010.3007v3
Fuchs, C.A.: Distinguishability and accessible information in quantum theory. Ph.D. thesis, University of New Mexico (1996). quant-ph/9601020
Gottesman, D., Lo, H.-K.: Proof of security of quantum key distribution with two-way classical communications. IEEE Trans. Inf. Theor. 49(2), 457–475 (2003). quant-ph/0105121
Hayden, P., Leung, D.W., Shor, P., Winter, A.: Randomizing quantum states: constructions and applications. Comm. Math. Phys. 250(2), 371–391 (2004). quant-ph/0307104
Hayden, P., Preskill, J.: Black holes as mirrors: quantum information in random subsystems. J. High Energy Phys. 07(09), 120 (2007)
Henderson, L., Vedral, V.: Classical, quantum and total correlations. J. Phys. A Math. Gen. 34(35), 6899 (2001)
König, R., Renner, R., Bariska, A., Maurer, U.: Locking of accessible information and implications for the security of quantum cryptography. Phys. Rev. Lett. 98, 140502 (2007). quant-ph/0512021
Lo, H.-K., Chau, H.-F.: Unconditional security of quantum key distribution over arbitrarily long distances. Science 283(5410), 2050–2056 (1999). quant-ph/9803006
Lo, H.-K., Chau, H.-F., Ardehali, M.: Efficient quantum key distribution scheme and proof of its unconditional security. J. Cryptol. 18, 133 (2005). quant-ph/0011056
Lloyd, S.: Almost certain escape from black holes in final state projection models. Phys. Rev. Lett. 96, 061302 (2006)
Nielsen, M.A., Chuang, I.L.: Quantum Computation and Quantum Information. Cambridge University Press, New York (2000)
Ollivier, H., Zurek, W.H.: Quantum discord: a measure of the quantumness of correlations. Phys. Rev. Lett. 88, 017901 (2001)
Renner, R., König, R.: Universally composable privacy amplification against quantum adversaries. In: Second Theory of Cryptography Conference (TCC 2005), vol. 3378, pp. 407–425 (2005). quant-ph/0403133
Smolin, J., Oppenheim, J.: Locking information in black holes. Phys. Rev. Lett. 96(8), 081302 (2006)
Shor, P., Preskill, J.: Simple proof of security of the BB84 quantum key distribution protocol. Phys. Rev. Lett. 85, 1 (2000). quant-ph/0003004
Sekino, Y., Susskind, L.: Fast scramblers. J. High Energy Phys. 10, 65 (2008). arXiv:0808.2096
Werlang, T., Souza, S., Fanchini, F.F., Villas Boas, C.J.: Robustness of quantum discord to sudden death. Phys. Rev. A 80, 024103 (2009)
Acknowledgments
Andreas Winter has independently established some locking results for generic unitary transformations. We would like to thank Jonathan Oppenheim for helpful discussions and the Mittag-Leffler Institute for its kind hospitality. This research was supported by the Canada Research Chairs program, the Perimeter Institute, CIFAR, CFI, FQRNT’s INTRIQ, MITACS, NSERC, ORF, ONR through grant N000140811249, QuantumWorks, and the Swiss National Science Foundation through grant no. 200021-119868.
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Dupuis, F., Florjanczyk, J., Hayden, P., Leung, D. (2014). The Locking-Decoding Frontier for Generic Dynamics. In: Bacon, D., Martin-Delgado, M., Roetteler, M. (eds) Theory of Quantum Computation, Communication, and Cryptography. TQC 2011. Lecture Notes in Computer Science(), vol 6745. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-54429-3_3
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DOI: https://doi.org/10.1007/978-3-642-54429-3_3
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