Category: Technology

Error measurements for a quantum annealer
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Error measurements for a quantum annealer

A finite length ferromagnetic chain with opposite spin polarization imposed at its two ends is one of the simplest frustrated spin models. In the clean classical limit the domain wall inserted on account of the boundary conditions resides with equal probability on any one of the bonds, and the degeneracy is precisely equal to the […]

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Limits on atomic qubit control from laser noise
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Limits on atomic qubit control from laser noise

Researchers studied the unique spectral structure of laser noise and introduced a metric that determines when a stabilised laser source has been optimised for quantum control of atomic qubits. Technical noise present in laser systems can limit their ability to perform high fidelity quantum control of atomic qubits. The ultimate fidelity floor for atomic qubits […]

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A quantum router architecture for high-fidelity entanglement
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A quantum router architecture for high-fidelity entanglement

The past decade has seen tremendous progress in experimentally realizing the building blocks of quantum repeaters. Repeater architectures with multiplexed quantum memories have been proposed to increase entanglement distribution rates, but an open challenge is to maintain entanglement fidelity over long-distance links. A team of researchers has addressed this topic with a quantum router architecture […]

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A quantum processor to emulate a small organic molecule
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A quantum processor to emulate a small organic molecule

A team of quantum computer physicists at UNSW Sydney has engineered a quantum processor at the atomic scale to simulate the behavior of a small organic molecule, solving a challenge set some 60 years ago by theoretical physicist Richard Feynman. The achievement represents a major milestone in the race to build the world’s first quantum […]

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Breakthrough in controlling light for quantum
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Breakthrough in controlling light for quantum

Scientists at the University of Exeter and the University of Sheffield have made a pivotal new breakthrough in the quest to control light to evolve the next generation of quantum sensing and computing. They have shown that controlling light can be achieved by inducing and measuring a nonlinear phase shift down to a single polariton […]

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Topological superconductors and Majorana particle
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Topological superconductors and Majorana particle

A new review investigates the search of Majorana fermions in iron-based superconductors. The elusive Majorana fermion, or ‘angel particle‘ simultaneously behaves like a particle and an antiparticle — and surprisingly remains stable rather than being self-destructive. Majorana fermions promise information and communications technology with zero resistance, addressing the rising energy consumption of modern electronics (already […]

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Nanostructured surfaces for future quantum computer chips
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Nanostructured surfaces for future quantum computer chips

Researchers at Paderborn University have developed a new technology for manipulating light that can be used as a basis for future optical quantum computers. New optical elements for manipulating light will allow for more advanced applications in modern information technology, particularly in quantum computers. However, a major challenge that remains is non-reciprocal light propagation through […]

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Breakthrough in integrated photonics
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Breakthrough in integrated photonics

Scientists at EPFL, Switzerland, have built a compact waveguide amplifier by successfully incorporating rare-earth ions into integrated photonic circuits. The device produces record output power compared to commercial fiber amplifiers, a first in the development of integrated photonics over the last decades. Erbium-doped fiber amplifiers (EDFAs) are devices that can provide gain to the optical […]

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Slowing quantum decoherence of oscillators by hybrid processing
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Slowing quantum decoherence of oscillators by hybrid processing

Quantum information encoded into the superposition of coherent states is an illustrative representation of practical applications of macroscopic quantum coherence possessing. However, these states are very sensitive to energy loss, losing their non-classical aspects of coherence very rapidly. An available deterministic strategy to slow down this decoherence process is to apply a Gaussian squeezing transformation […]

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