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- W2208464813 abstract "We investigate capacitively coupled two-qubit quantum gates based on quantum dots. For exchange-only coded qubits electron spin $S$ and its projection $S_z$ are exact quantum numbers. Capacitive coupling between qubits, as distinct from interqubit exchange, preserves these quantum numbers. We prove, both analytically and numerically, that conservation of the spins of individual qubits has dramatic effect on performance of two-qubit gates. By varying the level splittings of individual qubits, $J_a$ and $J_b$, and the interqubit coupling time $t$, we can find an infinite number of triples $(J_a, J_b, t)$ for which the two-qubit entanglement, in combination with appropriate single-qubit rotations, can produce an exact CNOT gate. This statement is true for practically arbitrary magnitude and form of capacitive interqubit coupling. Our findings promise a large decrease in the number of nonlocal (two-qubit) operations in quantum circuits." @default.
- W2208464813 created "2016-06-24" @default.
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- W2208464813 date "2015-09-09" @default.
- W2208464813 modified "2023-09-25" @default.
- W2208464813 title "Exact CNOT gates with a single nonlocal rotation for quantum-dot qubits" @default.
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- W2208464813 doi "https://doi.org/10.1103/physrevb.92.125409" @default.
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