[CLAIMS] 1. A quantum memory device comprising a holographic medium storing qubits as persistent interference patterns. 2. A quantum memory device wherein the holographic medium comprises a topological material. 3. A quantum memory device wherein phase coherence is maintained through geometric constraints. 4. A quantum memory device wherein quantum states are reconstructable from partial medium degradation. 5. A phase-modulation system comprising a coherent wave source configured to generate quantum interference patterns. 6. A phase-modulation system wherein the wave source is spectrally matched to a holographic medium’s band structure. 7. A method of quantum computation comprising encoding information as interference fringes. 8. A method of quantum computation comprising reading quantum states through phase differential measurements. 9. A method of quantum computation comprising correcting errors via geometric reconstruction. 10. A quantum computing system comprising a holographic memory device storing interference patterns. 11. A quantum computing system comprising a classical processor optimizing phase relationships. 12. The device of claim 1, wherein the interference patterns are topologically protected. 13. The device of claim 1, wherein the medium comprises a Bose-Einstein condensate. 14. The device of claim 1, further comprising a phase-stabilizing coating. 15. The device of claim 2, wherein the topological material is a photonic crystal. 16. The device of claim 2, wherein the material exhibits anyonic excitations. 17. The system of claim 5, wherein the wave source is a mode-locked laser. 18. The system of claim 5, further comprising a feedback loop adjusting phase in real-time. 19. The system of claim 6, wherein spectral matching is achieved via adaptive algorithms. 20. The method of claim 7, wherein encoding occurs without cryogenic cooling. 21. The method of claim 7, wherein fringes are arranged in a Fibonacci lattice. 22. The method of claim 9, wherein reconstruction uses machine learning.