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Future Computing Technology: Quantum Computing and its Growth
Published in Durgesh Kumar Mishra, Nilanjan Dey, Bharat Singh Deora, Amit Joshi, ICT for Competitive Strategies, 2020
Priyanka Soni, Bharat Singh Deora
While these superconducting qubits have a broad electromagnetic crosssection, inter-qubit coupling is easy for them even in complex topologies [32]. Plenty of excellent review works on superconducting qubits are available [33–38].
A Novel Heuristic Method for Linear Nearest Neighbour Realization of Reversible Circuits
Published in IETE Journal of Research, 2022
Anirban Bhattacharjee, Chandan Bandyopadhyay, Hafizur Rahaman
The states of qubits are so fragile that environmental noises can easily influence them causing computational errors. To fix these errors, it has been suggested through experimentation that the interacting qubits of any quantum gate need to be placed close to each other [1]. Furthermore, the authors of [2] stated that the nearest neighbour interaction between physical qubits is needed for the practical realization of Quantum Boolean Circuits (QBC). Therefore, establishing the interaction between the qubits at adjacent positions has turned out to be a necessary design criterion for some quantum technologies such as ion-trap [3], nuclear magnetic resonance [4], quantum dot [5], and superconducting qubits [6]. Control of the interaction distance between the inputs (control and target qubits) of any multi-qubit (two or more qubits) gates can be achieved by the restrictions of the J-coupling force [7] that isneeded to conduct multi-qubit operations effectively. This can only be possible by placing the qubits adjacent. Such a restriction of qubit interaction is termed Nearest Neighbour (NN) condition. Nearest Neighbour design in 1D architecture is the most widely used design architecture where the qubits are placed linearly across a single dimension, referred to as Linear Nearest Neighbour (LNN) architecture. Such a layout structure has been considered for addressing the NN optimization problem in this paper. Several research contributions related to the NN optimization in a linear topological structure have been reported, and a review of some of these works is discussed next.
Fast preparation of entangled states of two qutrits in cavity or circuit QED
Published in Journal of Modern Optics, 2019
Over the past decade, entanglement has been created in different systems. For instance, experimentalists have created entanglement using fourteen trapped ions (15), eight photons via linear optical devices (16, 17), electron spins in two proximal nitrogen-vacancy centres (18), two atoms in cavity QED (19, 20), two excitons in a single quantum dot (21), five superconducting qubits coupled through capacitors (22), and up to ten superconducting qubits based on circuit QED (23–29).
Non-classicality of two superconducting-qubits interacting independently with a resonator cavity: trace-norm correlation and Bures-distance entanglement
Published in Journal of Modern Optics, 2021
A.-B. A. Mohamed, H. A. Hessian
The considered model consist of a pair of spatially isolated charge-qubits, which are individually coupled to a superconducting resonator [54–56]. The qubit-resonator interaction starts with a maximally entangled Bell-state. The charge-qubit is represented by a Cooper-pair box (CPB) contains two coupled junctions with the gate voltage source , the capacitance and the dimensionless gate charge . The tuning between the two junctions is occurred by applying a classical magnetic field with the capacitance and the energy . If the applied magnetic flux field is controlled, with respect to the flux quantum , to be and , the qubit-resonator system, in the rotating wave approximation, is described by the following Hamiltonian: [57–59], where , are frequencies of the i-qubit and i-resonator respectively. is the resonator operators. are the i-qubit operators which are spanned by the up and down states, and are the i-qubit operators. The frequency resonances (resonant/off-resonant) of i-qubit-resonator are represented by the qubit-resonator detuning: . It is also worth pointing out that the model in Equation (1) is very generic for many physical systems including cavity QED with neutral atoms, quantum dot systems and superconducting qubits.