Stationary entanglement of a levitated oscillator with an optical field.

Levitated nanosphere exhibits robust stationary entanglement with light at room temperature, surpassing classical bounds and enabling quantum communication.

• Why it matters: Achieving entanglement between macroscopic objects and light is crucial for testing quantum physics and developing quantum technologies, yet remains challenging at ambient conditions.
• What they did: The team used heterodyne detection to reconstruct optomechanical correlations in a nanosphere levitated inside an optical cavity, demonstrating nonclassical entanglement beyond the interaction region.
• The result: This work confirms that levitated optomechanical systems can sustain entanglement under realistic conditions, paving the way for macroscopic quantum tests and continuous-variable quantum communication.