Los alamos daily post web problem11/27/2023 ![]() “No direct interactions between the computational qubits and no time-dependent interactions with the central spin are needed in the process,” he said. “Then a single magnetic pulse that acts only on the central spin implements the most complex part of the quantum Grover’s algorithm.” Called the Grover’s oracle, this quantum operation points to the desired solution. “We noticed that for many famous computational problems, it is sufficient to have a quantum system with elementary interactions, in which only a single quantum spin - realizable with two qubits - interacts with the rest of the computational qubits,” Sinitsyn said. The Los Alamos theorists proposed an intriguing alternative. A conventional quantum computer implements quantum circuits - sequences of elementary operations with different pairs of qubits. ![]() Quantum computers are built to perform computations much faster than any classical device can do, but they have been extremely hard to realize so far, Sinitsyn said. The algorithm is well-suited to idealized, error-corrected quantum computers, although it is difficult to implement on today’s error-prone machines. For instance, Sinitsyn said, Grover’s algorithm can be used to divvy up the runtime for tasks equally between two computers, so they finish at the same time, along with other practical jobs. As one of the best-known quantum algorithms, it allows unstructured searches of large data sets that gobble up conventional computing resources. The Los Alamos team’s theoretical paper showed how the approach could solve a number-partitioning problem using Grover’s algorithm faster than existing quantum computers. Thus, the qubits live for relatively a long time, Sinitsyn said. The new approach relies on natural rather than induced entanglement, so it requires fewer connections among qubits. True error correction has not yet been implemented on quantum hardware. That happens quickly, limiting the computation time. Entanglement breaks down in a process known as decoherence, as the entangled qubits begin to interact with the world outside the quantum system of the computer, introducing errors. Quantum computing remains a nascent field handicapped by the difficulty of connecting qubits in long strings of logic gates and maintaining the quantum entanglement required for computation. Sinitsyn said the approach could be used to solve many practical problems proposed for quantum computers. The precise evolution of the spin states is all that is needed to implement the algorithm. Instead of setting up a complex system of logic gates among a number of qubits that must all share quantum entanglement, the new strategy uses a simple magnetic field to rotate the qubits, such as the spins of electrons, in a natural system. A qubit is the basic unit of quantum information, analogous to a bit in familiar classical computing. Modern technologies in ultracold atoms are sufficiently advanced to demonstrate such computations with about 40 to 60 qubits, he said, which is enough to solve many problems not currently accessible by classical, or binary, computation. Sinitsyn said the team hopes to collaborate with experimental physicists also at Los Alamos to demonstrate their approach using ultracold atoms. ![]() “Natural systems, such as the electronic spins of defects in diamond, have precisely the type of interactions needed for our computation process.” He is coauthor of a paper on the approach, which was published on August 14 in the journal Physical Review A. La escuela regresará al horario regular el 18 de enero de 2023.“Our finding eliminates many challenging requirements for quantum hardware,” said Nikolai Sinitsyn, a theoretical physicist at Los Alamos National Laboratory. Se pronostica más nieve a lo largo del día. Todas las clases están canceladas.Ĭuando la escuela termina temprano o se cancela por el día, todos los programas después de la escuela, incluyendo los deportes y actividades extracurriculares están cancelados.Puede encontrar actualizaciones en nuestro sitio web. Las Escuelas Públicas de Los Álamos están cerradas el día de hoy. School will resume on a normal schedule Jan. When school is dismissed early or cancelled for the day, all after school programs including athletics (both home and away contests) and activities are canceled.įind updates on the LAPS website at and at. Los Alamos Public Schools (LAPS) will be closing for the day as more snow is predicted throughout the day. All classes are canceled.
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