Quantum Secure Direct Communication with Quantum Memory

Ding, Dong-Sheng; Sheng, Yu‐Bo; Zhou, Lan; Shi, Bao‐Sen; Guo, Guang‐Can

doi:10.1103/physrevlett.118.220501

Cited by 550 publications

(285 citation statements)

References 37 publications

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“…Up to the present relatively many schemes for quantum secure communication have been worked out (Hassanpour, 2015;Joy, 2017;Liu, 2013;Long, 2007;Yan, 2004;Zhang, 2017), taking into account the fact that the field of quantum communication is really juvenile.…”

Section: Quantum Primitivesmentioning

confidence: 99%

Quantum secure communication models comparison

Bebrov

Димова

2017

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IntroductionCommunication, in its general sense, is a sharing of information between two or more parties by any means regardless of the distance. There are two main aspects that ensure the proper communication process. They are information security that involves CIA (Confidentiality, Integrity, Availability) (Nieles, 2017) and reliability. In the following, we shall consider ourselves only with the security, in particular, the confidentiality. A solution to the confidentiality problem in communication systems is the encryption of the sharing data during its transfer, i.e., making use of cryptographic primitives in the communications.In the world of classical cryptography, one can distinguish two main classes of cryptographic primitives: symmetric and asymmetric (Stallings, 2017). Aside from their assets though, these types of primitives have substantial drawbacks, which could lead to compromising the confidentiality of communication systems. The problem of symmetric cryptography is related to not having reliable key distribution, whereas the problem of the common asymmetric cryptography is not the key distribution, but not being quantum-resistant, that is, it can be easily broken by algorithms run on quantum computers. However, there exist classical crypto methods not having such drawbacks, i.e., being assumed to be completely secure (Cheng, 2017). Although secure nowadays, the latter, for their being computational-complexity-based, could in some future instant of time be broken by discovering appropriate algorithms.Luckily, alongside the quantum computing, the field of quantum cryptography has blossomed as well. The latter could be even resistant to possible quantum attacks, that is to say, it is the only known technique at this time that provides an unconditional privacy in data transfer. As opposed to its classical counterpart, the quantum cryptography secureness is due to its utter reliance on the physical laws governing the microscopic world of fundamental particles (e.g. photons). In order to break the cryptography of this kind, one has to get over the laws of Nature, an action unlikely to be done.This kind of cryptography consists in using fundamental particles as data carriers. The information is encoded into the properties of the particles, which manifest quantum character whose fuzziness and strangeness provide uncracking masquerade of the data. In addition to that, the quantum cryptography has the advantage over its classical counterpart in that it is able to not only conceal the information transmitted over an insecure channel but also to reveal the presence of an unauthorized person, an eavesdropper, in a communication link. That is why, for the two reasons just mentioned, the quantum cryptographic primitives are regarded as probably the most powerful tool against any kind of attacks known to date.In general, there exist two main types of quantum primitives -quantum secure communication (QSC) and quantum key distribution (QKD), which are considered in Section 2. Particular attention will

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Section: Quantum Primitivesmentioning

confidence: 99%

Quantum secure communication models comparison

Bebrov

Димова

2017

AJTUV

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“…Furthermore, QSDC also can be used to transfer the key for cryptography securely, which has the potential for higher capacity than quantum key distribution [16]. On the experimental side, two table-top experiments were reported recently for proof-of-principle demonstrations of QSDC protocols based on single photons and entanglement [17,18]. In the entanglement-based QSDC experiment, the photon pairs are transferred in free-space and stored in quantum memories based on atomic ensembles [17].…”

Section: Introductionmentioning

confidence: 99%

“…The entangled photon pairs are stored in fiber coils, which have higher efficiency than atomic quantum memories at telecom band [17]. After security test of the quantum channel, the information is encoded on polarizations of the photon pairs.…”

Section: Introductionmentioning

confidence: 99%

“…On the experimental side, two table-top experiments were reported recently for proof-of-principle demonstrations of QSDC protocols based on single photons and entanglement [17,18]. In the entanglement-based QSDC experiment, the photon pairs are transferred in free-space and stored in quantum memories based on atomic ensembles [17]. The information is encoded on polarizations of entangled photon pairs and discriminated by quantum state tomography (QST) technology [19].…”

Section: Introductionmentioning

confidence: 99%

“…Then the photons are transferred over optical fibers of 0.5 km. In the process of information decoding, we use the Bell state measurement (BSM) to take over the density matrix constructing [17], showing that the fidelities of the two polarization entangled Bell states are 91% and 88%, respectively, after their fiber transmission. We analyze the performance of the QSDC system theoretically and shows that QSDC over a fiber link of several tens kilometers could be expected under current optical communication technologies.…”

Section: Introductionmentioning

confidence: 99%

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