On distilling secure key from reducible private states and (non)existence of entangled key-undistillable states
نویسندگان
چکیده
منابع مشابه
Quantum key distribution based on arbitrarily weak distillable entangled states.
States with private correlations but little or no distillable entanglement were recently reported. Here, we consider the secure distribution of such states, i.e., the situation when an adversary gives two parties such states and they have to verify privacy. We present a protocol which enables the parties to extract from such untrusted states an arbitrarily long and secure key, even though the a...
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We prove the security of a quantum key distribution scheme based on transmission of squeezed quantum states of a harmonic oscillator. Our proof employs quantum error-correcting codes that encode a finitedimensional quantum system in the infinite-dimensional Hilbert space of an oscillator, and protect against errors that shift the canonical variables p and q. If the noise in the quantum channel ...
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Entanglement is a fundamental resource for quantum information processing. In its pure form, it allows quantum teleportation [1] and sharing classical secrets [2]. Realistic quantum states are noisy and their usefulness is only partially understood. Bound entangled states are central to this question—they have no distillable entanglement [3], yet sometimes still have a private classical key [4,...
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A significant limitation of practical quantum key distribution (QKD) setups is currently their limited operational range. It has recently been emphasized [1] that entanglement-based QKD systems can tolerate higher channel losses than systems based on weak coherent laser pulses (WCP), in particular when the source is located symmetrically between the two communicating parties, Alice and Bob. In ...
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Quantum key distribution enables two remote parties to grow a shared key, which they can use for unconditionally secure communication over a certain distance. The maximal distance depends on the loss and the excess noise of the connecting quantum channel. Several quantum key distribution schemes based on coherent states and continuous variable measurements are resilient to high loss in the chan...
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ژورنال
عنوان ژورنال: New Journal of Physics
سال: 2018
ISSN: 1367-2630
DOI: 10.1088/1367-2630/aad75a