Here, we report the implementation of a practical quantum secure communication system.
However, it remains a technical feat to bring QSDC into a practical application. Recently, remarkable progress has been made in proof-of-principle experimental demonstrations of QSDC. In contrast to other branches of quantum communication, it transmits secret information directly. Quantum secure direct communication (QSDC) is one important branch of quantum communication. Using the principles of quantum mechanics, quantum communication offers provable security of communication and is a promising solution to counter such threats. Rapid development of supercomputers and the prospect of quantum computers are posing increasingly serious threats to the security of communication. error correction codes, implementations of unitary gates or more generally any noise process affecting a quantum system. Our tools can be used to reliably certify the performance of e.g. We illustrate its usage and performance with several simulated examples.
Optimal recovery quantum error correction software#
We also provide a software package-QPtomographer-implementing our estimator for the diamond norm and the worst-case entanglement fidelity. Our method enables reliable estimation of essentially any figure-of-merit for quantum processes on few qubits, including the diamond distance to a specific noise model, the entanglement fidelity, and the worst-case entanglement fidelity, by identifying error regions which contain the true state with high probability. Here, we provide a solution to this problem by constructing a confidence region estimator for quantum processes. Unless appropriate error bars can be constructed, the point estimate does not carry any sound operational interpretation. Due to statistical fluctuations, however, other processes close to the point estimate can also produce the observed data with near certainty. Our analyses open up a new venue in the study of entanglement fidelity and measure of entanglement by demonstrating that each measure of entanglement solely defines its own entanglement fidelity.Ĭurrent techniques in quantum process tomography typically return a single point estimate of an unknown process based on a finite albeit large amount of measurement data. The results, in addition, expose inability of the so-called entanglement fidelity for detecting, in a broad sense, entanglement preservation through quantum channels.
It is shown that the entangling aspect of the so-called entanglement fidelity is neither of type entanglement of formation and concurrence nor of type negativity. New entanglement fidelities based upon these measures of entanglement are introduced and statistically compared with the so-called previously introduced entanglement fidelity. Here, we aim to investigate association between the so-called entanglement fidelity and some measures of entanglement, namely, entanglement of formation, concurrence and negativity. Since there are different types of measures of entanglement, one may expect an entanglement fidelity to associate with its own measure of entanglement counterpart. Nevertheless, the amount of entanglement present in a state of a quantum system at any time is measured by quantities known as measures of entanglement.
The notion of entanglement fidelity is to measure entanglement preservation through quantum channels. Therefore, QSDC is possible with current measurement devices by sacrificing a small amount in the capacity. It is found that the MDI-QSDC secrecy capacity is only slightly lower than that of QSDC utilizing perfect measurement devices. The security capacity is derived, and its lower bound is given. In passing, a security loophole in one of the MDI-QSDC protocols (Niu et al. In this paper, we complete the quantitative security analysis of the MDI-QSDC protocols, one based on EPR pairs and one based on single photons. Recently measurement-device-independent (MDI) QSDC protocols in which the measurement is performed by an untrusted party using imperfect measurement devices have been constructed, and MDI-QSDC eliminates the security loopholes originating from the imperfections in measurement devices so that enable applications of QSDC with current technology. It not only prevents eavesdropping during transmission, but also eliminates the security loophole associated with key storage and management. Quantum secure direct communication (QSDC) is an important branch of quantum communication that transmits confidential messages directly in a quantum channel without utilizing encryption and decryption.
0 kommentar(er)
