D-Wave Slides from SC07 progress in quantum computing panel
coderman
coderman at gmail.com
Sat Dec 1 17:33:54 PST 2007
http://dwave.wordpress.com/2007/11/26/slides-from-sc07-progress-in-quantum-computing-panel/
click on Mr. T for the power point file. (hah!)
i love the prominent featuring of Google partnership on this project.
surely Google / In-Q-Tel dollars will surge through the floodgates of
measured skepticism shortly...
some highlights:
---
D-Wave approach: Superconducting adiabatic quantum computer
- Extremely fast: Special purpose processor; superconducting
electronics are naturally fast (700+ GHz)
- Extremely low power: In principle reversible (zero heat generation);
in practice power consumption & heat generation drastically reduced
(factors of millions)
- At the limits of physics: Universal quantum computer can't do better
---
slides 14-21 are nice visualizations of the adiabatic QC implementation and use.
---
adiabatic quantum computation model:
- Computer initialized in "easy to reach" (convex) ground state
- Answer encoded in final state
- All currents adjusted slowly enough so that system remains in ground
state at all times
- AQC can be universal for QC [ed: this is the crux, algorithms to
express some problems in AQC model difficult (right now)]
- AQC is exact by definition
---
quantum annealing computation model:
- Computer initialized in ground state
- Answer encoded in final state
- All currents adjusted over period of time fixed by user [ed: key
difference wrt AQC]
- QA is a heuristic algorithm [ed: key difference wrt AQC]
---
D-Wave processors can implement either AQC or QA models of computation.
---
Summary of preliminary result
- A set of progressively more powerful superconducting quantum
processors have been built [ed: 28 qubits in demo]
- Next generation Q3/2008 targets competition with incumbent QUBO
solver methods (500+ qubits)
- Web services architecture operational at several levels of
abstraction from hardware; APIs documented and available
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