The Photonic Lathe: 100,000 Custom-Made Photons express
Creating light with an exact number of photons is like stamping exactly 100,000 flawless coins. Until now, physicists could only control dozens of particles. The 'optical lathe' technology breaks this barrier: virtual lenses, like milling cutters, eliminate 'blurriness' and ensure each bunch contains exactly the specified number of photons. Counting becomes perfect. The secret is that the mathematics of light in lenses and the mathematics of photon counting turned out to be twins. This made it possible to borrow techniques from spectral analysis and minimize disorder. The more photons you need to produce, the faster the 'lathe' spins: 100,000 particles are created nearly three times faster than 10,000 – nature helps scale up precision. Such giant 'Fock state' bunches bridge the quantum world to the everyday. They will be useful in gravitational wave detectors and for protecting quantum computers from errors. The dreams of pioneers – Roy Glauber and Serge Haroche – are becoming engineering reality.
Original abstract
as written by the authors arXiv:2601.05118
The scalable preparation of bosonic quantum states with macroscopic excitations poses a fundamental challenge in quantum technologies, limited by control complexity and photon-loss rates that severely constrain prior theoretical and experimental efforts to merely dozens of excitations per mode. Here, based on the duality of the quantum state evolution in Fock state space and the optical wave-function propagation in a waveguide array, we introduce a Kerr-engineered multi-lens protocol in a single bosonic mode to deterministically generate Fock states exceeding $$10,000$$ photons. By optimizing phase and displacement operations across lens groups, our approach compensates for non-paraxial aberrations, achieving fidelities above $$73\%$$ in numerical simulations for photon numbers up to $$N=100,000$$. Counterintuitively, the protocol's execution time scales as $$N^{-1/2}$$ with the target photon number $$N$$, exhibiting robustness against the photon loss. Our framework enables exploration of quantum-to-classical transitions of giant Fock states, paving the way for advanced quantum metrology with significant quantum gains, and error-corrected quantum information processing in high-dimensional Hilbert spaces.
An incandescent bulb emits 10²⁰ chaotic photons per second; the new method is like a flawless column of soldiers, each one accounted for.