64 results for “quantum”
In PRX Quantum, Brij Mohan of the University of Oulu and three co-authors show theoretically that in closed quantum batteries, fluctuations in work and power cannot both be made small at once. Collective charging, which interacts all cells together, raises power but lowers its reliability, while charging with mid-range interactions offers a possible compromise.
A University of Vienna research team activated a photonic quantum processor aboard a small satellite, successfully measuring two-photon interference and unitary transformations in orbit. Despite losing half its detectors and suffering laser degradation, the experiment demonstrated the resilience of photonic quantum operations in the space environment.
BlueQubit reports generating 1 million samples in 19 seconds using 61 qubits on IBM's Nighthawk r2. We examine the roughly 110-year classical-computing estimate and how the output quality was verified, based on the preprint paper.
Infleqtion says it ran a circuit using 30 logical qubits on 80 atoms. We look at what the roughly 25% figure actually compares, how lost atoms were handled after the fact, how it differs from earlier work, and what still needs verification.
Researchers stored a photon in an atomic ensemble to enlarge a hybrid entangled state of light, reaching a size metric of 2.4 after correcting for detection loss. Here's what the record covers, how quantumness was verified, and the limits of an unreviewed preprint.
An international research team including Duke University used 13 trapped ions to observe the spatiotemporal evolution of string breaking in a 1D gauge theory on a quantum simulator. Unlike the Schwinger mechanism, in which particle-antiparticle pairs form throughout the vacuum, the team found a new breaking pathway in which pairs are induced starting from the string's endpoints.
Researchers have proposed QUOPS, a metric that measures both the size of computation a quantum computer can run and its effective speed. We look at the four-machine comparison, the trial overhead of error mitigation, and the assumptions behind targets such as RSA-2048.
A team at the University of Science and Technology of China has developed an 87Rb atomic magnetometer with a 7cm³ sensor head and under 5W power consumption. Its 10pT/√Hz sensitivity falls short of commercial devices, but it tracks field changes of 25,200nT per second and auto-relocks in under one second. The subway station test demonstrated resilience to disturbances, not submarine detection capability.
A Stanford research team used a superconducting qubit to achieve real-time observation of quantum jumps as single phonons are lost inside a microscopic mechanical resonator. This article examines the statistics from roughly 8,447 measurement trajectories showing discontinuous transitions, along with the measurement backaction challenges that remain on the path toward quantum memory.
IonQ says a simulation shows a standard 12-core Apple M4 Max MacBook Pro can decode quantum error correction in real time for circuits as large as 408 logical qubits. The result depends on assumed 1-5 ms ion-trap cycle times, and computation-time overhead ranges from 0.02% to 11.53% depending on conditions.
