Advertisement Editor’s Picks 20 Entangled Qubits Bring the Quantum Computer Closer Quantum Computers Strive to Break Out of the Lab Key Researchers on the Pace and Peculiarities of Developing Quantum Computing—and the Possible End of Bitcoin Quantum computing is all the rage. It seems like hardly a day goes by without some news outlet describing the extraordinary things this technology promises. Most commentators forget, or just gloss over, the fact that people have been working on quantum computing for decades—and without any practical results to show for it. We’ve been told that quantum computers could “provide breakthroughs in many disciplines, including materials and drug discovery, the optimization of complex manmade systems, and artificial intelligence.” We’ve been assured that quantum computers will “forever alter our economic, industrial, academic, and societal landscape.” We’ve even been told that … [Read more...] about The Case Against Quantum Computing

# Universal quantum computer

## Another Step Forward on Universal Quantum Computer

Researchers have demonstrated holonomic quantum gates under zero-magnetic field at room temperature, which will enable the realization of fast and fault-tolerant universal quantum computers. A quantum computer is a powerful machine with the potential to solve complex problems much faster than today's conventional computer can. Researchers are currently working on the next step in quantum computing: building a universal quantum computer. The paper, published in the journal Nature Communications, reports experimental demonstration of non-adiabatic and non-abelian holonomic quantum gates over a geometric spin qubit on an electron or nitrogen nucleus, which paves the way to realizing a universal quantum computer. The geometric phase is currently a key issue in quantum physics. A holonomic quantum gate manipulating purely the geometric phase in the degenerate ground state system is believed to be an ideal way to build a fault-tolerant universal quantum computer. The geometric phase … [Read more...] about Another Step Forward on Universal Quantum Computer

## World-first Quantum Computer Simulation of Chemical Bonds Using Trapped Ions

An international group of researchers has achieved the world's first multi-qubit demonstration of a quantum chemistry calculation performed on a system of trapped ions, one of the leading hardware platforms in the race to develop a universal quantum computer. The research, led by University of Sydney physicist Dr. Cornelius Hempel, explores a promising pathway for developing effective ways to model chemical bonds and reactions using quantum computers. It is published today in the prestigious Physical Review X of the American Physical Society. "Even the largest supercomputers are struggling to model accurately anything but the most basic chemistry. Quantum computers simulating nature, however, unlock a whole new way of understanding matter. They will provide us with a new tool to solve problems in materials science, medicine and industrial chemistry using simulations." With quantum computing still in its infancy, it remains unclear exactly what problems these devices will be … [Read more...] about World-first Quantum Computer Simulation of Chemical Bonds Using Trapped Ions

## Google’s 72-Bit Quantum Computer Better Not Be Evil

What is “Quantum Supremacy?” No, it’s not some kind of space racism. Rather, it’s the theory that a powerful enough quantum computer could be much more powerful than the traditional supercomputers we all know and love. And it’s a theory because so far we just haven’t been able to make a quantum computer that powerful. Until now. As part of its everlasting quest to not be evil, Google revealed its first 72-Qubit universal quantum computer. Why does Google’s new record-breaking quantum computer, “Bristlecone,” need 72 of the quantum computer unit qubits? That’s when the benefits of quantum computing really start to become apparent. Google’s previous 9-bit quantum computers wouldn’t beat a supercomputer. Google and IBM toyed around with numbers like 49 qubits and 56 qubits. But Google went with 72 qubits for this chip to be safe. Making a supercomputer to rival a 72-qubit quantum computer requires such exponentially … [Read more...] about Google’s 72-Bit Quantum Computer Better Not Be Evil

## Google Unveils 72-Qubit Quantum Computer With Low Error Rates

Google's Bristlecone quantum computer Google announced a 72-qubit universal quantum computer that promises the same low error rates the company saw in its first 9-qubit quantum computer. Google believes that this quantum computer, called Bristlecone, will be able to bring us to an age of quantum supremacy. Ready For Quantum Supremacy Google has teased before that it would build a 49-qubit quantum computer to achieve “quantum supremacy.” This achievement would show that quantum computers can perform some well-defined science problems faster than the fastest supercomputers in the world can. In a recent announcement, Google said: If a quantum processor can be operated with low enough error, it would be able to outperform a classical supercomputer on a well-defined computer science problem, an achievement known as quantum supremacy. These random circuits must be large in both number of qubits as well as computational length (depth). Although no one has achieved this goal … [Read more...] about Google Unveils 72-Qubit Quantum Computer With Low Error Rates