All our former experience with application of quantum theory seems to say that what is
predicted by quantum formalism must occur in the laboratory. But the essence of quantum …

Catalysts open up new reaction pathways that can speed up chemical reactions while not
consuming the catalyst. A similar phenomenon has been discovered in quantum information …

It is control that turns scientific knowledge into useful technology: in physics and engineering
it provides a systematic way for driving a dynamical system from a given initial state into a …

We consider quantum circuits made of controlled-NOT (CNOT) gates and single-qubit
unitary gates and look for constructions that minimize the use of CNOT gates. We show, by …

What is the minimal size quantum circuit required to exactly implement a specified n-qubit
unitary operation, U, without the use of ancilla qubits? We show that a lower bound on the …

Magnetic nano-skyrmions develop quantized helicity excitations, and the quantum tunneling
between nano-skyrmions possessing distinct helicities is indicative of the quantum nature of …

Quantum computer architectures impose restrictions on qubit interactions. We propose
efficient circuit transformations that modify a given quantum circuit to fit an architecture …

Quantum computers [1–4] are explicitly quantum mechanical systems that use phenomena
such as superposition and entanglement to perform computational tasks more efficiently …

The two-qubit interaction Hamiltonian of a given physical implementation determines
whether or not a two-qubit gate such as the controlled-NOT (CNOT) gate can be realized …

We explore the dynamics of entanglement in classically chaotic systems by considering a
multiqubit system that behaves collectively as a spin system obeying the dynamics of the …