--- # **Claims** 1. A quantum memory device comprising a holographic medium configured to store qubits as phase-amplitude interference patterns. 2. The quantum memory device of claim 1, wherein the holographic medium is a photonic topological insulator. 3. The quantum memory device of claim 1, wherein the holographic medium is a Bose-Einstein condensate. 4. The quantum memory device of claim 1, wherein the holographic medium operates at temperatures above 77K. 5. A phase-modulation system configured to write qubits to the holographic medium of claim 1 by generating interference patterns. 6. The phase-modulation system of claim 5, wherein the system uses coherent electromagnetic waves between 400nm and 1600nm wavelengths. 7. A method of storing quantum information, comprising: encoding qubits as phase-amplitude interference patterns in a holographic medium. 8. The method of claim 7, further comprising reading qubit states by measuring phase differentials across the medium. 9. The method of claim 7, further comprising correcting errors via geometric reconstruction of interference fringes. 10. A quantum computing system comprising: the quantum memory device of claim 1; and the phase-modulation system of claim 5. 11. The quantum computing system of claim 10, further comprising a classical processor configured to optimize phase modulation via machine learning. 12. A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the phase-modulation system of claim 5 to encode qubits as interference patterns.