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Archive for the ‘quantum physics’ category: Page 7

Oct 17, 2024

Quantum research breakthrough uses synthetic dimensions to efficiently process quantum information

Posted by in categories: innovation, quantum physics

A new study opens the door to cutting-edge solutions that could contribute to the realization of a system capable of processing quantum information in a simple yet powerful way.

Oct 17, 2024

Novel superconducting flux qubit can operate without being surrounded by a magnetic field

Posted by in categories: computing, quantum physics

A team of computer engineers from the National Institute of Information and Communications Technology, NTT Corporation and Nagoya University have developed what they claim is the world’s first superconducting flux qubit that can operate without the need for a surrounding magnetic field.

Oct 17, 2024

Non-Abelian Transport Distinguishes Three Usually Equivalent Notions of Entropy Production

Posted by in categories: particle physics, quantum physics

Twesh Upadhyaya, William F. Braasch, Jr., Gabriel T. Landi, and Nicole Yunger Halpern PRX Quantum 5, 030355 – Published 23 September 2024 https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.5.


As an ice cube melts in water, the heat exchange d by the two produces disorder. Imagine measuring the heat flow while the ice melts in each of many trials. From the measurement results, one can compute the disorder generated in each trial—the stochastic entropy production (SEP). The SEP is well understood in the case of two classical systems interacting; there is one widely accepted SEP definition that can be expressed equivalently via three formulas. But the situation is far murkier for quantum analogues, such as two atoms exchanging components of spin.

Generalizing the three SEP formulas to accommodate quantum systems, we prove that quantum effects render the three SEP formulas inequivalent. Each formula reasonably quantifies entropy production and highlights a different aspect of the underlying physics. The inequivalence of the formulas stems from the inability to simultaneously measure the exchange d quantities of the quantum systems, i.e., the uncertainty principle. This quantumness leads to negative and even nonreal entropy production. Though unusual, these entropy values herald notable physical phenomena. A negative entropy production signals superposition in the thermal initial states of the quantum systems. An imaginary entropy production witnesses contextuality, a precise notion of nonclassicality.

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Oct 17, 2024

Dr. Leonard Tender, Ph.D. — Biological Technologies Office, DARPA — Next Generation Biomanufacturing

Posted by in categories: biological, chemistry, climatology, engineering, government, policy, quantum physics

Next Generation Biomanufacturing Technologies — Dr. Leonard Tender, Ph.D. — Biological Technologies Office, Defense Advanced Research Projects Agency — DARPA


Dr. Leonard Tender, Ph.D. is a Program Manager in the Biological Technologies Office at DARPA (https://www.darpa.mil/staff/dr-leonar…) where his research interests include developing new methods for user-defined control of biological processes, and climate and supply chain resilience.

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Oct 17, 2024

Diabolical Nanomagnets

Posted by in categories: nanotechnology, particle physics, quantum physics

A quantum degeneracy named after a Chinese yo-yo boosts the magnetization lifetime of a short chain of magnetic iron atoms by a factor of 1000.

Oct 17, 2024

Building the quantum workforce

Posted by in categories: computing, quantum physics

Engineers, physicists, computer scientists and more are needed for the second quantum revolution.

Oct 17, 2024

Hybrid quantum error correction technique integrates continuous and discrete variables

Posted by in categories: computing, quantum physics

A major challenge in realizing quantum computers is the development of quantum error correction technology. This technology offers a solution for addressing errors that occur in the qubit, the basic unit of quantum computation, and prevents them from being amplified during the computation.

Oct 17, 2024

Researchers reveal quantum advantage that could advance future sensing devices

Posted by in categories: biotech/medical, quantum physics

Researchers from the Department of Energy’s Oak Ridge National Laboratory have taken a major step forward in using quantum mechanics to enhance sensing devices, a new advancement that could be used in a wide range of areas, including materials characterization, improved imaging and biological and medical applications.

Oct 17, 2024

New method to generate photon pairs efficiently on a chip

Posted by in categories: computing, quantum physics

Thin-film lithium niobate is an emerging nonlinear integrated photonics platform ideally suited for quantum applications. Through spontaneous parametric down-conversion (SPDC), it can generate correlated photon pairs for quantum key distribution, teleportation, and computing.

Oct 16, 2024

‘Quantum Memory’ Proves Exponentially Powerful

Posted by in categories: quantum physics, robotics/AI

Quantum memory lets a quantum computer perform a task not necessarily with fewer steps, but with less data. Could this in itself be a way to prove quantum advantage?


The new papers show that quantum memory lets a quantum computer perform a task not necessarily with fewer steps, but with less data. As a result, researchers believe this in itself could be a way to prove quantum advantage. “It allows us to, in the more near term, already achieve that kind of quantum advantage,” said Hsin-Yuan Huang, a physicist at Google Quantum AI.

But researchers are excited about the practical benefits too, as the new results make it easier for researchers to understand complex quantum systems.

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