
## Acknowledgments

$$\mathrm{P}\qquad\qquad\mathrm{E}$$

## References

$$t e r s\quad74$$

E
Physical Review Letters  74 P

$$J.\ \ S t a t\,.$$

Phys. 29 Scientific American

$$\begin{array}{c c}{{\mathrm{E}}}&{{\mathrm{V}}}\\ {{S y m p.\,\,\,o n\,\,\,\,T h e o r y\,\,\,o f o m p u t a i o n}}\end{array}$$

Proc. 25th ACM

 *Proof. of the Workshop on Physics and Computation (PhysCompg4)* : EEE $\mathcal{P}$
E
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$$\left(P h y s C o m p\,g6\right)$$
 $\begin{array}{cccc}\text{P}&&&\\ \text{E}&&&Proc.\;\;of\;\;the\;\;\;Workshop\;\;on\\ &&&\text{N}&\text{E}\end{array}$
Proc. of the Workshop on Physics and Computation P
/

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$$\mathrm{NP}$$
$$\begin{array}{l}{{\mathrm{V}}}\\ {{P h y s i c a l\ R e v i e w\ A\ \ \not A8}}\end{array}$$
NP

$$\mathrm{\boldmath~P~}\mathrm{\boldmath~K~}$$
$$\mathrm{K}$$
$$\mathrm{V}$$
$\int$
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63