Leon Ding, William Oliver, and David Rower. Credit: MIT

Record-Breaking 99.998% Quantum Gate Fidelity with Fluxonium Qubits

MIT researchers achieved a groundbreaking 99.998% single-qubit fidelity in quantum computing through innovative fluxonium qubit control techniques, combining commensurate pulses and synthetic circularly polarized light to overcome counter-rotating errors, marking a crucial advancement toward practical quantum error correction and fault-tolerant quantum computing.

Study authors P. James Schuck (left) and Chiara Trovatello from the Schuck lab at Columbia Engineering. Credit: Jane Nisselson/Columbia Engineering

Miniature Device Generates Entangled Photons in Breakthrough Design

This work represents the embodiment of the long-sought goal of bridging macroscopic and microscopic nonlinear and quantum optics,” says Schuck, who co-directs Columbia’s MS in Quantum Science and Technology. “It provides the foundation for scalable, highly efficient on-chip integrable devices such as tunable microscopic entangled-photon-pair generators.

The Tweezer Team at Durham University and their experimental apparatus. From left: Dr. Daniel Ruttley, Prof. Simon Cornish, Dr. Alexander Guttridge, and Mr. Tom Hepworth. Credit: Durham University

Record-Breaking Entanglement with Magic-Wavelength Tweezers

Quantum entanglement is a remarkable phenomenon where two particles become interconnected, so that the state of one instantly affects the other, no matter how far apart they are. This unique property is a cornerstone of quantum computing and a range of advanced technological applications. While entanglement has been achieved with atoms, achieving it with complex molecules is a significant step forward because molecules offer additional structures and properties, such as vibration and rotation, that can be leveraged in advanced quantum applications.

SiGeSn/GeSn multi-quantum-well structure.

Group IV Laser Bridges Silicon-Photonics Gap

In a groundbreaking development published in Nature Communications, an international research team has created the first electrically pumped continuous-wave semiconductor laser compatible with silicon integration. The device, constructed from group IV elements using stacked layers of silicon-germanium-tin and germanium-tin, operates with minimal power requirements comparable to an LED.

Schematic of the charger-battery setup

Dephasing enabled fast charging of quantum batteries

Researchers have analyzed a universal method to obtain fast charging of a quantum battery by a driven charger system using controlled, pure dephasing of the charger. While the battery displays coherent underdamped oscillations of energy […]

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SandboxAQ Secures $300M to Scale Large Quantitative Models

SandboxAQ has announced a significant funding round of over $300 million from prominent investors including Fred Alger Management, T. Rowe Price Associates, Mumtalakat, and notable individuals like Eric Schmidt, Marc Benioff and Yann LeCun. The […]

Professor Liang Feng and group members Xilin Feng, Tianwei Wu, and Shuang Wu, from left. Credit: Bella Ciervo

Quantum Physics Powers New Era of Ultra-Fast Optical Switches

Researchers at the University of Pennsylvania’s School of Engineering and Applied Science have developed a revolutionary photonic switch that transforms data transmission in fiber-optic networks. The switch, detailed in Nature Photonics, measures just 85 by […]

Antimony Atom Brings Schrödinger’s Cat to Life

UNSW researchers have achieved a significant breakthrough in quantum computing by implementing the Schrödinger’s cat thought experiment using an antimony atom, as published in Nature Physics. Led by Professor Andrea Morello, the team developed a […]

Schematic of the experimental setup including a spectrally-multiplexed photon pair source, a VIPA-based demultiplexer for mapping spectral modes to distinct spatial channels, and a Tm3+:LiNbO3-based spectral filter: APD - avalanche photodiode; DDG - digital delay generator; SNSPD - superconducting nanowire single photon detector; AD - achromatic Doublet (focusing lens coupling the output beam into collection fiber).

Towards a spectrally multiplexed quantum repeater

Extended quantum networks are based on quantum repeaters that often rely on the distribution of entanglement in an efficient and heralded fashion over multiple network nodes. Many repeater architectures require multiplexed sources of entangled photon […]

Quadrupolar Resonance Spectroscopy of Individual Nuclei Using a Room-Temperature Quantum Sensor

Engineers Break Ground with Single-Atom Detection Technology

Engineers at Penn Engineering have achieved a remarkable advancement in Nuclear Quadrupolar Resonance (NQR) spectroscopy, developing a technique capable of detecting signals from individual atoms. This breakthrough represents a significant leap forward from traditional methods […]

Semi-Dirac fermions at nodal-line crossing points in ZrSiS

Discovery of Semi-Dirac Fermions in ZrSiS Crystals

Scientists have made a groundbreaking discovery of semi-Dirac fermions, unique quasiparticles that exhibit both massless and massive behavior depending on their direction of movement. This discovery was made in crystals of the semi-metal ZrSiS by […]

Excitonic pairing and two-component FQHE

Fractional Exciton: A New Quantum Particle!

Scientists at Brown University have made a significant breakthrough by discovering a new class of quantum particles called fractional excitons, which display characteristics of both fermions and bosons. The research, published in Nature on January […]