Quantum networks with laser control

Tom A. W. Wolterink, Ravitej Uppu, Klaus J. Boller +1 more

Santosh Kumar, Deepak Kumar

Recently, we propose a scalable quantum network [Phys. Rev. A, 85 052317 (2012)], in which all quantum operations can be executed through external control lasers. This scheme has a drawback that the number of qubits are logN for a network of N nodes. We are perusing procedure which may circumvent this disadvantage.

Cheng Li Wu

Shingo Fujiwara, Shuichi Hasegawa

It is well known that, in order to build the universal quantum circuit, one only needs one-qubit rotation gate and two-qubit controlled-NOT gate and until now quantum networks have been built from these gates. However, the minimum components of quantum networks in real experiments are not these quantum gates, so we develop a general method for realizing the conditional phase-shift gate in multiqubit ion-trap quantum computation which has the scalability to $N$ qubits $(N\ensuremath{\geqslant}3)$. The duration of the laser manipulations for the proposed conditional phase-shift gate is almost the same as that for the controlled-NOT gate in ion-trap quantum computation. Moreover, we simulate Grover's algorithm taking into consideration the real laser fluctuations and analyze the effect of decoherence on the practical search.

Anders Karlsson, L. Gillner, E. Goobar +1 more

Anand Choudhary, Ajay Wasan

The nature-inspired field of quantum communication has witnessed exciting developments over the past few years with countries all over the world working hard to scale their experimental quantum networks to larger sizes and increased coverage. Evidently, quantum network simulators are the need of the hour as they provide a framework for tuning hardware parameters, optimizing control protocols, and testing configurations of large and complex quantum networks before their deployment in the real world. In this work, we present ShaNQar, Simulator of Network Quantique, a modular and customizable photonic quantum network simulator. It comprises models of components such as photons, lasers, neutral density filters, sources of entangled photon pairs, communication channels, mirrors, waveplates, beam splitters, single photon detectors, and nodes which incorporate a diverse set of tunable parameters for variability and versatility. It enables adaptive timing control and synchronization with virtually no simulation time resolution limit and features a plug-and-play design for faster coding and execution. We successfully simulated previous real-life experimental setups for quantum key distribution and quantum teleportation, thereby, demonstrating the reliability and accuracy of ShaNQar.