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Archive for the ‘quantum physics’ category: Page 3

Oct 15, 2024

Dual-species atomic arrays show promise for quantum error correction

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

A study in Nature Physics has realized a dual-species Rydberg array combining rubidium (Rb) and cesium (Cs) atoms to enhance quantum computing and its applications.

Oct 15, 2024

Digital quantum simulation of nuclear magnetic resonance experiments

Posted by in categories: chemistry, computing, quantum physics

Programmable quantum computers have the potential to efficiently simulate increasingly complex molecular structures, electronic structures, chemical reactions, and quantum mechanical states in chemistry that classical computers cannot. As the molecule’s size and complexity increase, so do the computational resources required to model it.

Oct 15, 2024

Study explores the physical origin of errors in a spin qubit processor

Posted by in categories: computing, quantum physics

To achieve remarkable performances, quantum computing systems based on multiple qubits must attain high-fidelity entanglement between their underlying qubits. Past studies have shown that solid-state quantum platforms—quantum computing systems based on solid materials—are highly prone to errors, which can adversely impact the coherence between qubits and their overall performance.

Oct 15, 2024

Physicists uncover behavior in quantum superconductors that provides a new level of control

Posted by in categories: computing, quantum physics

A new study has uncovered important behavior in the flow of electric current through quantum superconductors, potentially advancing the development of future technologies like quantum computing.

Oct 15, 2024

Quantum research unlocks PET scan potential in disease detection

Posted by in categories: biotech/medical, neuroscience, quantum physics

New research in quantum entanglement could vastly improve disease detection, such as for cancer and Alzheimer’s disease.

Oct 14, 2024

Quantum Experiment Reveals Two Realities Coexisting Simultaneously

Posted by in category: quantum physics

A quantum experiment revealed two observers can experience different, coexisting realities.

Our understanding of reality is often shaped by biases—our senses, cultures, and knowledge influence how we see the world. But even science, often regarded as a path to objective truth, may not always offer a single, consistent version of reality. A recent experiment testing a 1961 thought experiment by Nobel Prize winner Eugen Wigner highlights this issue, showing that two versions of reality can coexist in the quantum world.

Wigner’s Friend: The Thought Experiment Wigner’s thought experiment, known as “Wigner’s Friend,” explores a scenario in quantum mechanics where two observers can experience contradictory realities. The setup involves a quantum system, such as a photon with two possible polarizations (horizontal or vertical), that exists in a state of superposition, meaning both states exist at the same time until measured.

Oct 14, 2024

Quantum teleportation implies symmetry-protected topological order

Posted by in category: quantum physics

Now in Quantum: by Yifan Hong, David T. Stephen, and Aaron J. Friedman https://doi.org/10.22331/q-2024-10-10-1499


Yifan Hong, David T. Stephen, and Aaron J. Friedman, Quantum 8, 1499 (2024). We constrain a broad class of teleportation protocols using insights from locality. In the “standard” teleportation protocols we consider, all outcome-dependent unitaries are Pauli operators conditioned on linear functions of the measurement outcomes. We find that all such protocols involve preparing a “resource state” exhibiting symmetry-protected topological (SPT) order with Abelian protecting symmetry $\mathcal{G}_{k}= (\mathbb{Z}_2 \times \mathbb{Z}_2)^k$. The $k$ logical states are teleported between the edges of the chain by measuring the corresponding $2k$ string order parameters in the bulk and applying outcome-dependent Paulis. Hence, this single class of nontrivial SPT states is both necessary and sufficient for the standard teleportation of $k$ qubits. We illustrate this result with several examples, including the cluster state, variants thereof, and a nonstabilizer hypergraph state.

Oct 14, 2024

Understanding Qubits: The Heartbeat of Quantum Computing

Posted by in categories: biotech/medical, computing, encryption, quantum physics

Discover how qubits, the building blocks of quantum computing, are revolutionizing fields like medicine and cryptography. Learn why they’re the future.

Oct 14, 2024

Korean firm first to achieve ‘chemical accuracy’ in quantum computing

Posted by in categories: chemistry, computing, information science, quantum physics

The platform-agnostic algorithm ignores information related to noise in quantum computers to prevent compounding errors.

Oct 14, 2024

Edge Supercurrents Drive Quantum Advances in Superconductivity

Posted by in categories: materials, quantum physics

Research on superconductivity has taken a significant leap with Princeton Universitys exploration of edge supercurrents in topological superconductors like molybdenum telluride.

Initially elusive, these supercurrents have been observed and enhanced through experiments with niobium, leading to intriguing phenomena such as stochastic switching and anti-hysteresis, altering the understanding of electron behavior in superconductors.

Superconductivity and Topological Materials.

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