The security of our data is the prime priority as it is said “Data is the new Oil”. Nowadays, most of our communications are either recorded or forged. There are algorithms used under classical encryption, such as Rivest-Shamir-Adleman (RSA), digital signature, elliptic-curve cryptography (ECC), and more, to protect our communication and data. However, these algorithms are breakable with the help of Quantum Cryptography. In addition, this technology provides the most secure form of communication between entities under the fundamental law of Physics. Here, we are abiding to discuss the term “Quantum Cryptography.” The aim of this paper is to explore the knowledge related to the Quantum Cryptography, Quantum Key Distribution; and their elements, implementation, and the latest research. Moreover, exploration of the loopholes and the security of Internet of Things (IoT) infrastructure and current used classical cryptographic algorithms are described in the paper.