Computer Science · Artificial Intelligence
Researchers generated quantum entanglement between a levitated silica nanosphere and a propagating optical field at room temperature. The result suggests that levitated mechanical systems could connect stationary objects with light for quantum communication and tests of macroscopic quantum physics.
A study proposes encoding each quantum bit into several physical qubits before measurement, then using a majority vote to decode the result. Simulations based on noise profiles from superconducting quantum platforms found that the approach suppressed measurement errors by several orders of magnitude with a modest linear increase in qubit use.
Researchers describe how a refractive-index boundary moving at the speed of light could trap weak light in time rather than in a fixed region of space. The approach could store, compress and reshape very weak pulses, including single photons, while allowing controlled release through a one-way channel.
Researchers developed a quantum method for the maximum cut problem and proved a stronger worst-case guarantee than a three-round version of a widely used approach. On IBM quantum devices with 72 and 148 qubits, the method exceeded a known classical hardness threshold, while the comparison method did not do so in the 148-qubit test.
Researchers present a modular algorithm for preparing general mixed quantum states on quantum computers. Tests covered two-qubit examples and random states involving one, two and three qubits, but the abstract does not report performance measures or scaling limits.
