Abstract: A method for secure quantum communication includes generating a photon. The method includes modulating at least two quantum state dimensions selected from the group consisting of orbital angular momentum (OAM), polarization, and phase of the photon to form a composite quantum state. The method includes directing the photon to an emission point on a structure having a defined spatial coordinate corresponding to classical data. The method includes emitting the photon from the emission point into a quantum channel. The composite quantum state and emission-point spatial coordinate jointly encode secure quantum information for transmission.

Abstract: A quantum computing system may include a dual-helix quantum encoding structure a multidimensional modulation controller. The dual-helix quantum encoding structure may include a first helix chain and a second helix chain. The multidimensional modulation controller may be configured to modulate quantum information in the first and second helix chains using two or more of frequency modulation, phase modulation, and amplitude modulation. The frequency, phase, and amplitude modulation may enhance information processing, storage, parallel computation, and error correction in quantum computing systems. Alternatively or additionally, embodiments herein may provide a new direction for scaling quantum computers for large-scale, complex tasks, and may offer improvements in speed, accuracy, and efficiency.

Abstract: A method for secure quantum communication includes generating a photon. The method includes modulating at least two quantum state dimensions selected from the group consisting of orbital angular momentum (OAM), polarization, and phase of the photon to form a composite quantum state. The method includes directing the photon to an emission point on a structure having a defined spatial coordinate corresponding to classical data. The method includes emitting the photon from the emission point into a quantum channel. The composite quantum state and emission-point spatial coordinate jointly encode secure quantum information for transmission.

Abstract: A method for secure quantum communication includes generating a photon. The method includes modulating at least two quantum state dimensions selected from the group consisting of orbital angular momentum (OAM), polarization, and phase of the photon to form a composite quantum state. The method includes directing the photon to an emission point on a helical structure having a defined spatial coordinate corresponding to classical data. The method includes emitting the photon from the emission point into a quantum channel. The composite quantum state and spatial coordinate together encode secure information.