By using a geometrical approach, we investigate the behavior of the Quantum Toffoli Gate (QTG) in connection to quantum correlations. Special attention is paid to states with maximally mixed marginals. Finally and in the same vein, we scrutinize the Hadamard gate.

We construct a generalized controlled phased gate entangler for a multi-qubit state based on the geometrical structure of quantum systems. We also investigate relation between the generalized controlled phase construction of a quantum gate entangler and graph state for two-qubit and three-qubit states.

We study the effect of the spin-orbit interaction on quantum gate operations based on the spin exchange coupling where the qubit is represented by the electron spin in a quantum dot or a similar nanostructure. Our main result is the exact cancellation of the spin-orbit effects in the sequence producing the quantum XOR gate for the ideal case where the pulse shapes of the exchange and spin-orbit...

What additional gates are needed for a set of classical universal gates to do universal quantum computation? We answer this question by proving that any single-qubit real gate suffices, except those that preserve the computational basis. The result of Gottesman and Knill [3] implies that any quantum circuit involving only the Controlled-NOT and Hadamard gates can be efficiently simulated by a c...

This paper presents an improved ESOP-based reversible logic synthesis which utilizes cubes shared by multiple outputs and ensures that the implementation of each cube requires just one Toffoli gate. Thus it has the potential of minimizing the gate count and quantum cost. Experimental results show that this technique can reduce the quantum cost up to 75%, compared to the existing algorithm.

A quantum model based on solutions t o t he SchrÊdinger2Poisson equations is develop ed t o investigate t he device behavior related t o gate tunneling cur rent f or nanoscale MOS F ETs wit h high2 k gate stacks . This model can model various MOS device st ructures wit h combinations of high2 k dielect ric materials and multilayer gate stacks , revealing quantum effects on t he device perf orma...

Quantum computing is a form of unconventional computation utilizing quantum effects as a fundamental part of its calculations. It has already been used in practical signal encryption in the 2010 Soccer World Cup, and there is competition amongst many governments to build more powerful and practical quantum computers. Although quantum computing is the most widespread and invested in form of unco...

A hybrid system of light and matter qubits might allow to scale quantum communication to large distances using quantum repeaters and to increase the number of qubits in quantum computation. To this end, we have experimentally realized a robust two-qubit gate that allows to link distant computational nodes [1, 2]. The gate mechanism is deterministic, robust and expected to be applicable to almos...

Quantum algorithms may be described by sequences of unitary transformations called quantum gates and measurements applied to the quantum register of n quantum bits, qubits. A collection of quantum gates is called universal if it can be used to construct any n-qubit gate. In 1995, the universality of the set of one-qubit gates and controlled NOT gate was shown by Barenco et al. using QR decompos...