Enhancing Majorana stability with a three-site Kitaev chain

Scalable Kitaev Chains for Quantum Computing

A QuTech-led research team successfully created a three-site Kitaev chain in a hybrid InSb/Al nanowire that demonstrates enhanced stability of Majorana zero modes compared to two-site chains, marking significant progress toward scalable topological quantum computing.

Quantum skyrmions through noise.

Topological Quantum Resilience: Skyrmions Defeat Noise Barrier

Researchers have demonstrated that quantum information encoded in topological skyrmions remains resilient to environmental noise even as entanglement deteriorates, representing a breakthrough “digitization” approach that could revolutionize practical quantum technologies without requiring complex compensation strategies.

Experimental setup of the OPA at 1553 nm. DFB, distributed feedback; PPLN, periodically poled lithium niobate.

New 193nm Laser Creates Vortex Beams for Advanced Chipmaking

A groundbreaking compact solid-state laser system generates 193-nm coherent light for semiconductor lithography while also producing the first-ever 193-nm vortex beam carrying orbital angular momentum, offering superior coherence and potential applications in wafer processing, defect inspection, and quantum technologies.

Simulating two-dimensional lattice QED with matter fields.

Qudit Quantum Computing Breaks New Ground in Gauge Theory

Researchers from the University of Innsbruck and the University of Waterloo have achieved a breakthrough in quantum computing by using qudits (quantum units with multiple values) instead of traditional qubits to efficiently simulate quantum electrodynamics in two dimensions, demonstrating magnetic field interactions between particles and opening new possibilities for solving previously intractable problems in particle physics.

High-precision quantum gates with diamond spin qubits

High-precision quantum gates with diamond spin qubits

QuTech researchers, collaborating with Fujitsu and Element Six, have achieved a significant quantum computing milestone by demonstrating diamond spin-based quantum gates with error rates below 0.1%—satisfying a critical threshold for quantum error correction and bringing us one step closer to scalable quantum computation.

Experimental setup demonstrating entanglement between two photons. (a) The experimental setup: A 405 nm laser illuminates a β-barium borate (BBO) crystal to generate entangled photon pairs, with the idler photon in the upper arm and the signal photon in the lower arm. The metasurface (MS) encodes polarization information into holographic letters. (b) The signal photon’s hologram observed without a polarizer (eraser) in the idler arm. (c-f) Holograms with different polarizer orientations in the idler arm. The polarizer set to horizontal (H), diagonal (D), vertical (V), and antidiagonal (A) orientations selectively erases the corresponding letter in the holographic output. Credit: H. Liang et al., doi 10.1117/1.AP.7.2.026006

Quantum Holograms: Metasurfaces Unlock New Frontiers in Quantum Entanglement

Researchers have successfully created quantum holograms using metasurfaces, enabling unprecedented control over entangled photon pairs where the polarization of one photon can selectively erase holographic content in its partner, demonstrating precise quantum control with applications in secure communication and anti-counterfeiting technology.

Nonlinear superconducting resonator circuit for investigating dissipative phase transitions. Credit: Guillaume Beaulieu (EPFL)

Quantum Leap: New Phase Transitions Stabilize Computing

Researchers successfully observed “dissipative phase transitions” in quantum systems using a superconducting Kerr resonator at near-absolute zero temperatures, revealing phenomena like “squeezing,” metastability, and “critical slowing down” that could revolutionize quantum computing and sensing technologies through enhanced stability and precision.

Beyond Classical: D-Wave First to Demonstrate Quantum Supremacy on Useful, Real-World Problem

D-Wave First to Demonstrate Quantum Supremacy

D-Wave Quantum Inc. has achieved the world’s first demonstration of quantum computational supremacy on a useful real-world problem, using their Advantage2 prototype quantum annealer to perform complex magnetic materials simulations in minutes that would take a classical supercomputer nearly one million years and consume more than the world’s annual electricity.

Quantum Dot Stabilization Breakthrough

Quantum Dot Stabilization Breakthrough

Lead halide perovskite quantum dots covered with stacked phenethylammonium ligands exhibit nearly non-blinking single photon emission with high purity (~98%) and extraordinary photostability (12+ hours), solving critical surface defect issues through π-π stacking interactions that create a stabilizing epitaxial ligand layer, enabling reliable room-temperature quantum emission for advanced computing and communication applications.

In the new method, two boron nitride (n-BN) layers twisted with respect to each other create an electric field in a molybdenum diselenide semiconductor (MoSe2). A light beam (red) is used to study the properties of the electrons in the semiconductor. Credit: ETH Zurich

Harnessing Coulomb Interactions in Nanoscale Ferroelectric Moiré Structures

Researchers created a nanoscale ferroelectric moiré pattern using hexagonal boron nitride layers to generate a purely electrostatic potential that enhances Coulomb interactions in transition metal dichalcogenides, enabling optical detection of electron correlations and ordered states while opening pathways to explore exotic quantum phenomena like chiral layer-pseudospin liquids and kinetic magnetism.

Boosted Bell-state measurements for photonic quantum computation: Schematic of the experimental setup.

Boosted Bell-state measurements for photonic quantum computation

Researchers achieved a groundbreaking advancement in photonic quantum computing by implementing a boosted Bell-state measurement with a success probability of 69.3%, significantly exceeding the conventional 50% limit and demonstrating a threefold improvement in photon-loss tolerance for fault-tolerant fusion-based quantum computing.

Thermoelectric Cooper Pair Splitter.

Quantum Correlations in Cooper Pair Splitters: A Comprehensive Analysis

Recent experiments with superconductor-quantum dot hybrids demonstrate that contact-induced level broadening and hybridization effects in thermoelectric Cooper pair splitters lead to shifted resonances and parity reversal in thermoelectric current, revealing new avenues for harnessing nonlocal quantum correlations in solid-state systems through gate voltage control.

Stabilisers for the planar surface code.

The Reset Dilemma: Optimizing Quantum Error Correction

Quantum error correction experiments face a trade-off where unconditional qubit reset can theoretically double error tolerance during logical operations, but no-reset approaches perform better in practice when reset operations are slow or error-prone, prompting the development of novel syndrome extraction circuits to mitigate these limitations.

chematic diagram of the Zuchongzhi-3 chip. 105 qubits and 182 couplers are integrated on the same chip to perform quantum random circuit sampling tasks. Credit: USTC

China Quantum Computing Breakthrough with Zuchongzhi-3

Researchers at China’s USTC have developed Zuchongzhi-3, a groundbreaking 105-qubit quantum computer that processes calculations 10^15 times faster than the most powerful supercomputers and one million times faster than Google’s latest quantum systems, marking a significant advancement in quantum supremacy.

Daniel Blumenthal. Credit: Matt Perko, UC Santa Barbara

Miniaturizing Quantum Technologies with Integrated Photonics

A quantum photonics researcher who pioneered the miniaturization of cold atom trapping systems through integrated photonics at UC Santa Barbara, successfully developing the first photonic integrated 3D magneto-optical trap (PICMOT) that enables portable quantum technologies with applications in precision sensing, timekeeping, and quantum computing.

Error mitigation by temperature extrapolation.

Quantum error mitigation in quantum annealing

Researchers developed practical zero-noise extrapolation techniques for quantum annealing that successfully mitigate both thermal and non-thermal errors in quantum systems without additional qubit overhead, demonstrated through experiments on a transverse-field Ising spin chain that aligned well with theoretical predictions.

Matthew Chow, center, and Bethany Little discuss with Yuan-Yu Jau, off camera, the first practical way to detect atom loss for neutral atom quantum computing at Sandia National Laboratories. Credit: Craig Fritz, Sandia National Laboratories

Quantum Leap: Converting Atom-Loss Errors in Neutral-Atom Quantum Computing

Researchers have demonstrated circuit-based leakage-detection units that nondestructively identify atom-loss errors in neutral-atom quantum computers with 93.4% accuracy, including a “swap” variant that exchanges data and ancilla atoms, enabling quantum information to potentially outlive individual atoms in the quantum register.

Babak Seradjeh. Credit: Indiana University

Majorana Fermions Reveal New Patterns in Josephson Junctions

Researchers theoretically demonstrate that Floquet Majorana fermions in periodically driven topological superconductors create 4π-periodic Josephson currents with amplitudes that can be tuned by aligning chemical potentials with drive frequency harmonics, yielding a novel “Josephson Floquet sum rule.”

The pair of silicon microchips that compose the Ocelot logical-qubit memory chip.

Amazon announces Ocelot quantum chip

Amazon Web Services has unveiled Ocelot, a groundbreaking quantum chip that uses cat qubits and bosonic quantum error correction to significantly reduce resource requirements, achieving bit-flip times approaching one second while requiring only one-tenth the resources of traditional approaches, potentially revolutionizing the path to commercially viable quantum computing.

Illustration of the CAB procedure for assessing the fidelity of an n-qubit gate, U.

Calibrating quantum gates up to 52 qubits in a superconducting processor

Researchers successfully benchmarked quantum gates up to 52 qubits using a character-average benchmarking protocol, achieving a 63.09% ± 0.23% fidelity for a 44-qubit parallel CZ gate while demonstrating that optimizing global gate fidelity, rather than individual gate fidelities, yields superior performance by accounting for inter-gate correlations.

The overview of training formalism for the parameterized quantum comb framework.

Revolutionizing Quantum Process Transformation with PQComb

PQComb revolutionizes quantum information processing by employing parameterized quantum circuits to efficiently transform quantum processes, demonstrating significant improvements in resource efficiency and noise resilience while solving previously intractable problems in quantum unitary transformations.

The illustration shows the layers of semiconductor crystal stacked together. Electron orbitals within the layers are represented as sitting atop them. The double-lobed orbitals indicate the locations of excited electrons while single ellipsoids show the ground state, where empty spaces called holes are left behind. Although similar orbitals might be expected running front to back, or in and out of the layers, the research team co-led by the University of Regensburg and University of Michigan showed why excited electrons are mainly funneled into one orientation of this orbital. Credit: Brad Baxley, Part to Whole, edited; Copyright: DOI: 10.1038/s41563-025-02120-1

Quantum “Miracle Material” Enables Magnetic Switching

Researchers from the University of Regensburg and the University of Michigan discovered that chromium sulfide bromide functions as a quantum “miracle material” capable of encoding information in multiple forms (charge, light, magnetism, and vibrations) while its unique magnetic properties confine excitons to single layers or lines, significantly extending quantum information longevity and potentially enabling rapid conversion between photon and spin-based quantum information.