Quantum Circuits and Modules

Chia-Chun Lin, Amlan Chakrabarti, Niraj Kumar Jha

Quantum algorithms are known for their ability to solve some problems much faster than classical algorithms. They are executed on quantum circuits, which consist of a cascade of quantum gates. However, synthesis of quantum circuits is not straightforward because of the complexity of quantum algorithms. Generally, quantum algorithms contain two parts: classical and quantum. Thus, synthesizing circuits for the two parts separately reduces overall synthesis complexity. In addition, many quantum algorithms use similar subroutines that can be implemented with similar circuit modules. Because of their frequent use, it is important to use automated scripts to generate such modules efficiently. These modules can then be subjected to further synthesis optimizations. This article proposes QLib, a quantum module library, which contains scripts to generate quantum modules of different sizes and specifications for well-known quantum algorithms. Thus, QLib can also serve as a suite of benchmarks for quantum logic and physical synthesis.

В. А. Калмычков, Alexander Kukaev, Irina V. Matveeva

The module of conjugate coefficients permutation for unification of the quantum Fourier transform is considered. The scheme of quantum circuit adaptation from the logical level of the layout of multi-qubit quantum gates to the physical level of representation based on a set of basic gates is presented. An example of an automatically generated specification of a quantum circuit in the form of a program code in the OpenQASM language is given.

Dipankar Bhattacharyya, Jyotirmoy Guha

Tien-Sheng Lin, Yanlin Chen, Ting-Hsu Chang +2 more

Quantum circuit is a reversible circuit that can be designed the control module to derive the correlation between quantum input sequence and quantum output sequence. In addition, in this paper we use the control module of the quantum circuit to verify the equivalence of the quantum state such that quantum blind signature can achieve the security requirement of the signature scheme and resist eavesdropping from the outsider. The core concept of the proposed signature is based on the correlation of quantum entangled state to investigate that the message string and the signatory string is consistent. In regard to the security, the blindness and the failure of eavesdropping can be preserved by this work. The proposed signature can achieve impossibility of forgery and impossibility of disavowal.

Madhusudan Singh Irish Singh, Bharat S. Rawal