Quantronics Lab

Quantronics is composed of two words: Quantum and Electronics. Thus contains two scientific fields. The main research activity of this laboratory is quantum communication and optical quantum computation.
Quantum entanglement lays at the heart of quantum information processing (QIP) , which over the past twenty years has become an emerging field of modern physics. QIP can mainly be divided into the two areas of quantum communication and quantum computation. Quantum communication describes the transfer of quantum states over large distances, which can lead to drastic improvements in security – quantum cryptography – and channel capacity – quantum dense coding. It further covers the distribution of bi- or multi-partite entanglement between different parties, separated by large distances.
Quantum computation is dedicated to the implementation of algorithms that exploit the superposition character of quantum entanglement to dramatically speed up computational tasks such as a reduction of time needed to search an unsorted database of N elements. Any classical algorithm necessitates N operations to accomplish this task, whereas a quantum algorithm only needs N1/2 operations. Probably the most famous quantum algorithm is Shor’s algorithm to factorize large numbers. Its introduction in 1994 has jump started and fueled tremendous effort in the new field of QIP, both on the theoretical and experimental side.

 Dr. Hossein Arab 

Contact Information :

Nanoptronics Research Center, Electronics and Electrical Engineering Department, Iran University of Science and Technology, Narmak, Tehran, Iran
Tel.: (+98) 21-73222667
E-mail:ho_arabelec.iust.ac.ir
For more information please click here.

 Anahita Khodadad 

Ms.c. student at NRC
Email: 
 

 Design and Modeling of Quantum Repeater in Long-distance Quantum Communication

Quantum communication system transmits quantum information from one point to another point. Distribution and control of entanglement in global scale is required in long-distance quantum communication. Now, the only suitable system for long-distance quantum communication is photon. Photon-based protocols suffer from photon loss and quantum decoherence in quantum channels. These problems limit range of single photon transmission up to several tens of kilometers in silica fibers. This problem can be solved by dividing the long distances into shorter intervals, so that the entanglement can be preserved in the shorter distances. System, which is responsible for this task, is called quantum repeater.

 Linear optics quantum computing

Quantum computing has attracted much attention over the last 2 decades, partly because of its promise of superfast factoring and its potential for the efficient simulation of quantum dynamics. There are many different architectures for quantum computers based on many different physical systems. All of these systems have their own advantages in quantum information processing but no physical implementation seems to have a clear edge over others at this point. Optical quantum systems are prominent candidates for quantum computing, since they provide a natural integration of quantum computation and quantum communication. There are several proposals for building quantum computers that manipulate the state of light, ranging from cat-state logic to encoding a qubit in a harmonic oscillator and optical continuous-variable quantum computing. The main difficulty with any optical approach is that nonlinear interactions between individual photons are required in order to implement quantum logic gates that operate with 100% efficiency.

 Single Photon Counter