Quantum Computing with Photons

 demo : https://www.youtube.com/watch?v=t25UzI61NCA 1. Why Photons for Quantum Computing Photons do not interact much with the environment , so they are less noisy. They can be controlled at room temperature . Optical components (mirrors, beam splitters, wave plates) are easily available. Photons are easy to generate and detect compared to many other quantum systems. 2. Why the 6-Qubit Photonic Quantum Computer Is Special Photons do not interact with each other , making gate operations difficult. Most photonic systems are probabilistic (success < 100%). IISc’s 6-qubit system is fully deterministic (100% success) . Only 2 photons were used. Multiple degrees of freedom of photons were used to create 6 qubits . Gate operations were demonstrated efficiently. 3. Major Challenge in Photonic Quantum Computing Photon–photon interaction is weak → hard to create gates. Alignment of optical components requires nanometer/micrometer precisi...