. IBM announced Wednesday that they are moving closer to creating such a computer. The superpositions and quantum states of a quantum computer allow it to solve complex problems faster than conventional computers. Researchers were able to simultaneously detect and measure two types of quantum errors. They also demonstrated a square, new quantum bit circuit design that can scale up to greater dimensions. Layout of the IBM Four Qubit Square Circuit. The company can detect both kinds of quantum errors using a square lattice. This configuration allows for more qubits and scales well to bigger systems. Credit to IBM Research. A quantum computer will outperform all current computers. Quantum computers may open new possibilities in optimization and simulation, which are currently impossible with today’s computers. Researchers could create a quantum computer using 50 qubits, which are the equivalent of tens of thousands of current supercomputers. A.D. Corcoles and Srikanth J. Srinivasan along with Easwar Magesan and Srikanth W. Cross from the IBM T.J. Watson Research Center in Yorktown Heights, New York wrote about the breakthrough in Nature Communications. (citation below). They claim that they have demonstrated for the first-time the ability to measure phase-flip (and bit-flip) – the two kinds of quantum errors which can occur in any quantum computer. At any given time, it was impossible to fix one type of quantum error. It is essential to be able address both types simultaneously in order to correct quantum errors. This is vital for building a reliable and practical large-scale quantum computer. The new quantum bit circuit IBM’s complex quantum circuit is based on the square structure of four superconducting qubits placed on an approximately 1-inch square chip. This allows for both types of quantum error to be identified simultaneously. IBM chose a square-shaped layout over a linear array, which would prevent detection of both types of quantum errors simultaneously. This design allows for more quantum computing to be used to create working quantum systems. Image: ibmsystemsmag.com Quantum computing could speed up innovation. For instance, researchers in chemistry or physics would be able to create new molecules and materials without the need for costly trials and errors in the laboratory. This would potentially increase the speed of innovation across many industries. Quantum computers can quickly sort, organize, and maintain large amounts of unstructured, diverse data in a world that is increasingly dependent on Big Data. It could revolutionize the way people think and make crucial discoveries across all industries. Scientists trying to harness the power of quantum computing face a major problem: controlling and removing quantum coherence, which is the creation of errors due to interference by factors like heat and electromagnetic radiation. Because quantum data is so delicate, these errors can be especially severe in quantum computers. Jay Gambetta is a manager at the IBM Quantum Computing Group. He said that the errors are especially evident in quantum machines, where quantum data can be so fragile. A bit is the most fundamental datum, or piece of data that any computer can understand. Like a light beam that can be switched on and off, a bit only has two values. Qubits (quantum bits) can have values of ‘1 or ‘0, as well as both. This is called superposition, and it’s simply written as ‘0+1. IBM wrote: “The sign in this superposition is crucial because both the states 0 (and 1) have a phase relationship with each other. Two types of error are possible in such superposition states. The bit-flip type is when one of the digits (‘0’, ‘1 or both) flips. These errors are similar to the classical bit-flip error. Previous studies have demonstrated how qubits can detect them. Both types of error must be detected by quantum error correction. However, it isn’t enough to correct quantum errors because there may also exist phase-flip mistakes that flip the sign between the pase relationships of ‘0” and ‘1 in superposition states. Both types of error must be identified in order for quantum error corrections to work properly. Quantum information can be extremely fragile because it is lost when qubit technology interacts with electromagnetic radiation or matter. Researchers have found ways to extend the life of data by sharing it across multiple physical qubits. Surface code is the technical term for an error correction system that distributes quantum data over many qubits. Surface code is a way for one logical qubit to be encoded by only its nearest neighbors. This makes it reliable enough to carry out error-free operations. To measure two distinct syndromes (measurement qubits), the IBM scientists employed several methods. Each qubit reveals a different aspect of quantum data on the two qubits that are called code (or data qubits). Scientists wrote that each qubit revealed one aspect of quantum data stored on two qubits (code or data qubits).
