Category: Technology

Measuring entanglement without destroying it on commercial quantum computers
News, News, Swiss Quantum Hub, Switzerland, Technology

Measuring entanglement without destroying it on commercial quantum computers

In quantum mechanics, the act of measurement produces unavoidable perturbation (also called “back-action”) on the state of the measured system. This effect is, in many cases, not desirable, as back-action often limits the precision of repeated measurements. However, so-called Quantum Non-Demolition (QND) measurements ensure that the unavoidable and deleterious back-action is diverted onto other system […]

Read More
Quantum speed-up in optimization problems using Rydberg atoms
News, News, Technology

Quantum speed-up in optimization problems using Rydberg atoms

A collaboration between Harvard University with scientists at QuEra Computing, MIT, University of Innsbruck and other institutions has demonstrated a breakthrough application of neutral-atom quantum processors to solve problems of practical use. Previously, neutral-atom quantum processors had been proposed to efficiently encode certain hard combinatorial optimization problems. In this landmark publication, the authors not only […]

Read More
Frequency conversion of single photons at arbitrary wavelengths
News, News, Technology

Frequency conversion of single photons at arbitrary wavelengths

Researchers report a breakthrough in frequency up-conversion of single photons, based on a hollow-core Photonic Crystal Fiber (PCF) filled with hydrogen gas. First a spatio-temporal hologram of molecular vibrations is created in the gas by stimulated Raman scattering. This hologram is then used for highly efficient, correlation-preserving frequency conversion of single photons. The system operates […]

Read More
Scientists Develop Experimental Platform for the “Second Quantum Revolution”
News, News, Technology

Scientists Develop Experimental Platform for the “Second Quantum Revolution”

Researchers at Stony Brook University report the formation of matter-wave polaritons in an optical lattice, an experimental discovery that permits studies of a central QIST paradigm through direct quantum simulation using ultracold atoms. The scientists project that their novel quasiparticles, which mimic strongly interacting photons in materials and devices but circumvent some of the inherent […]

Read More
Long-range quantum entanglement needs three-way interaction
News, News, Technology

Long-range quantum entanglement needs three-way interaction

A new theorem from researchers at the RIKEN Center for Advanced Intelligence Project, Tokyo, and Keio University, Yokohama, provides an understanding of what types of long-range quantum entanglement survive at non-zero temperatures, revealing a fundamental aspect of macroscopic quantum phenomena and guiding the way towards further understanding of quantum systems and designing new room-temperature stable […]

Read More
Detecting positive quantum capacities of quantum channels
News, News, Technology

Detecting positive quantum capacities of quantum channels

Determining whether a noisy quantum channel can be used to reliably transmit quantum information is a challenging problem in quantum information theory. This is because it requires computation of the channel’s coherent information for an unbounded number of copies of the channel. A team of researchers has devised an elementary perturbative technique to solve this […]

Read More
QuTech and Fujitsu realise the fault-tolerant operation of a qubit
Netherlands, News, News, QuTech, Technology

QuTech and Fujitsu realise the fault-tolerant operation of a qubit

Researchers from QuTech, in collaboration with Fujitsu and Element Six, have demonstrated the fault-tolerant operation of a quantum bit using a quantum processor based on spin qubits in diamond. The team has realized a logical qubit using their recently introdued 29-qubit quantum processor. Their qubits consist of electron and nuclear spins associated with a nitrogen-vacancy […]

Read More
The quest for an ideal qubit
News, News, Technology

The quest for an ideal qubit

A team led by the U.S. Department of Energy’s (DOE) Argonne National Laboratory has announced the creation of a new qubit platform formed by freezing neon gas into a solid at very low temperatures, spraying electrons from a light bulb’s filament onto the solid, and trapping a single electron there. This system shows great promise […]

Read More