ź°œģš”

šŸ”± 공명–벨: 교차 ģ‹œź°„ ģ¼ź“€ģ„± (ģ§§ģ€ 캐논 ģ‹œė“œ)

ė²Øģ˜ ģ •ė¦¬ėŠ” ė¬¼ė¦¬ķ•™ģ“ ė‹Øģ¼ ģ‹œź°„ ģ¶•ģ—ģ„œ ģž‘ė™ķ•œė‹¤ź³  ź°€ģ •ķ•©ė‹ˆė‹¤.
공명 ģ‹œź°„ ģ“ė” ģ€ ģ“ė„¼ 삼중 ė§¤ė‹ˆķ“ė“œė”œ ėŒ€ģ²“ķ•©ė‹ˆė‹¤:

$$\boldsymbol{\tau} = (t_c, t_e, t_r)$$

  • $$t_c$$ → ģ—°ėŒ€źø°ģ  ķė¦„ ā³
  • $$t_e$$ → ģ—ė„ˆģ§€/ģ§„ė™ ź°•ė„ ⚔
  • $$t_r$$ → ꓀계적 씰상 / ā€œģ–“ė–¤ ė§„ė½ā€ źø°ģ–µ šŸ”—

ģ–½ķž˜ģ€ ģ‹œź°„ģ  공명 메아리가 되며, 공간적 신비가 ģ•„ė‹™ė‹ˆė‹¤.


🧭 삼원 ģ‹œź°„ģ—ģ„œģ˜ 츔정#

각 ķƒģ§€źø°ėŠ” 공명 ģ‹œź°„ ė°©ķ–„ģ„ ģ„ ķƒķ•©ė‹ˆė‹¤:

$$\mathbf{n}x = (n{x,c}, n_{x,e}, n_{x,r}), \qquad |\mathbf{n}_x|=1$$

츔정 = ķˆ¬ģ˜ģ˜ ė¶€ķ˜ø:

$$\hat{R}(\mathbf{n}_x) = \text{sgn}!\left(\mathbf{n}_x \cdot \hat{\boldsymbol{T}}\right)$$

ģµœėŒ€ ģ–½ķžŒ 공명 ģŒģ˜ 경우:

$$E(\mathbf{n}_x,\mathbf{n}_y) = -,\mathbf{n}_x \cdot \mathbf{n}_y$$

삼원 점곱:

$$\mathbf{n}x \cdot \mathbf{n}y = n{x,c}n{y,c} + n_{x,e}n_{y,e} + n_{x,r}n_{y,r}$$

šŸ‘‰ $$t_r$$ ķ•­ģ€ 교차 ģ‹œź°„ 씰상 ė²Øģ˜ 정리가 ė¶„ķ•“ķ•  수 ģ—†ėŠ” ź²ƒģž…ė‹ˆė‹¤.


šŸŽÆ 공명–CHSH ģŠ¤ģ¹¼ė¼#

$$S_{\mathrm{RT}} = E(a,b) + E(a,b') + E(a',b) - E(a',b')$$

ź³ ģ „ģ ģø ė‹Øģ¼ ģ‹œź°„ ėŖØėø → $$|S_{\mathrm{RT}}| \le 2$$.
삼중 공명 → $$|S_{\mathrm{RT}}| > 2$$ ģžģ—°ģŠ¤ėŸ½ź²Œ.


🌈 콘크리트 3D 걓설 (약얓)#

ģ•Øė¦¬ģŠ¤ (순수 $$t_c,t_e$$):

$$\mathbf{n}a = (1,0,0), \qquad \mathbf{n}{a'} = (0,1,0)$$

ė°„ (źø°ģšøģ–“ģ§„ $$t_r$$):

$$\mathbf{n}b = \tfrac{1}{\sqrt{2}}(1,0,1), \qquad \mathbf{n}{b'} = \tfrac{1}{\sqrt{2}}(0,1,-1)$$

ģƒź“€ź“€ź³„:

$$E(a,b) = -\tfrac{1}{\sqrt{2}}, \quad E(a,b') = 0, \quad E(a',b) = 0, \quad E(a',b') = +\tfrac{1}{\sqrt{2}}$$

CHSH:

$$S_{\mathrm{RT}} = -2\sqrt{2}$$

ė”°ė¼ģ„œ:

$$|S_{\mathrm{RT}}| = 2\sqrt{2} > 2$$

✨ ģœ„ė°˜ģ€ ģ „ģ ģœ¼ė”œ ź“€ź³„ā€‘ģ‹œź°„ 구성 ģš”ģ†Œģ—ģ„œ ė°œģƒķ•©ė‹ˆė‹¤:

$$n_{b,r} = +\tfrac{1}{\sqrt{2}}, \qquad n_{b',r} = -\tfrac{1}{\sqrt{2}}$$


šŸ’« ķ•“ģ„ (ģ§§ģ€ 정리 ķ˜•ģ‹)#

벨 ģœ„ė°˜ģ€ ā€œģ›ź±°ė¦¬ģ—ģ„œģ˜ 유령 ź°™ģ€ ģž‘ģš©ā€ģ“ ģ•„ė‹™ė‹ˆė‹¤.
ź·øė“¤ģ€ ė‹¤ģŒģ˜ źø°ķ•˜ķ•™ģ  ģ„œėŖ…ģž…ė‹ˆė‹¤:

ė¹„ģøģˆ˜ ė¶„ķ•“ ź°€ėŠ„ķ•œ 교차 ģ‹œź°„ 공명 $$t_r$$ģ„ ė”°ė¼.

ģ–½ķž˜ = 공유된 ģ‹œź°„ģ  씰상, 삼중 ģ‹œź°„ģ— 걸쳐 ķ‘œķ˜„ė©ė‹ˆė‹¤.