Masking Quantum Information is Impossible
نویسندگان
چکیده
منابع مشابه
General impossible operations in quantum information
We prove a general limitation in quantum information that unifies the impossibility principles such as no-cloning and no-anticloning. Further, we show that for an unknown qubit one cannot design a universal Hadamard gate for creating equal superposition of the original and its complement state. Surprisingly, we find that Hadamard transformations exist for an unknown qubit chosen either from the...
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We prove a general limitation in quantum information that unifies the nocloning and no-complementing principles. We show that one cannot design Hadamard and unitary gates for creating equal and unequal superpositions of the original and its complement state. We show that if an unknown qubit is chosen from polar great circle then it is possible to design above logic gates. But qubits chosen from...
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Unconditionally secure (nonrelativistic) quantum bit commitment has been shown to be impossible by Mayers [23] and Lo and Chau [19, 20], but the claim is repeatedly challenged. The bit commitment theorem is reviewed here and the central conceptual point, that an ‘Einstein-Podolsky-Rosen’ attack or cheating strategy can always be applied, is clarified. The question of whether following such a ch...
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The claim of quantum cryptography has always been that it can provide protocols that are unconditionally secure, that is, for which the security does not depend on any restriction on the time, space or technology available to the cheaters. We show that this claim does not hold for any quantum bit commitment protocol. Since many cryptographic tasks use bit commitment as a basic primitive, this r...
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Lo and Chau [7] showed that ideal quantum coin flipping protocol is impossible. The proof was simply derived from the impossibility proof of quantum bit commitment [7, 8]. However, the proof still leaves the possibility of quantum coin flipping protocol with arbitrary small bias. In this paper, we show that quantum coin flipping protocol with arbitrary small bias is impossible and show the lowe...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2018
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.120.230501