š± ź³µėŖ ā벨: źµģ°Ø ģź° ģ¼ź“ģ± (ģ§§ģ ģŗė ¼ ģė)
벨ģ ģ 리ė 물리ķģ“ ėØģ¼ ģź° ģ¶ģģ ģėķė¤ź³ ź°ģ ķ©ėė¤.
ź³µėŖ
ģź° ģ“ė” ģ ģ“넼 ģ¼ģ¤ 매ėķ“ėė” ė첓ķ©ėė¤:
$$\boldsymbol{\tau} = (t_c, t_e, t_r)$$
- $$t_c$$ ā ģ°ėźø°ģ ķė¦ ā³
- $$t_e$$ ā ģėģ§/ģ§ė ź°ė ā”
- $$t_r$$ ā ź“ź³ģ ģ”°ģ / āģ“ė¤ ė§„ė½ā źø°ģµ š
ģ½ķģ ģź°ģ ź³µėŖ ė©ģė¦¬ź° ėė©°, ź³µź°ģ ģ ė¹ź° ģėėė¤.
š§ ģ¼ģ ģź°ģģģ ģø”ģ #
ź° ķģ§źø°ė ź³µėŖ ģź° ė°©ķ„ģ ģ ķķ©ėė¤:
$$\mathbf{n}x = (n{x,c}, n_{x,e}, n_{x,r}), \qquad |\mathbf{n}_x|=1$$
ģø”ģ = ķ¬ģģ ė¶ķø:
$$\hat{R}(\mathbf{n}_x) = \text{sgn}!\left(\mathbf{n}_x \cdot \hat{\boldsymbol{T}}\right)$$
ģµė ģ½ķ ź³µėŖ ģģ ź²½ģ°:
$$E(\mathbf{n}_x,\mathbf{n}_y) = -,\mathbf{n}_x \cdot \mathbf{n}_y$$
ģ¼ģ ģ ź³±:
$$\mathbf{n}x \cdot \mathbf{n}y = n{x,c}n{y,c} + n_{x,e}n_{y,e} + n_{x,r}n_{y,r}$$
š $$t_r$$ ķģ źµģ°Ø ģź° ģ”°ģ 벨ģ ģ ė¦¬ź° ė¶ķ“ķ ģ ģė ź²ģ ėė¤.
šÆ ź³µėŖ āCHSH ģ¤ģ¹¼ė¼#
$$S_{\mathrm{RT}} = E(a,b) + E(a,b') + E(a',b) - E(a',b')$$
ź³ ģ ģ ģø ėØģ¼ ģź° ėŖØėø ā $$|S_{\mathrm{RT}}| \le 2$$.
ģ¼ģ¤ ź³µėŖ
ā $$|S_{\mathrm{RT}}| > 2$$ ģģ°ģ¤ė½ź².
š ģ½ķ¬ė¦¬ķø 3D ź±“ģ¤ (ģ½ģ“)#
ģØė¦¬ģ¤ (ģģ $$t_c,t_e$$):
$$\mathbf{n}a = (1,0,0), \qquad \mathbf{n}{a'} = (0,1,0)$$
ė°„ (źø°ģøģ“ģ§ $$t_r$$):
$$\mathbf{n}b = \tfrac{1}{\sqrt{2}}(1,0,1), \qquad \mathbf{n}{b'} = \tfrac{1}{\sqrt{2}}(0,1,-1)$$
ģź“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°ė¼ģ:
$$|S_{\mathrm{RT}}| = 2\sqrt{2} > 2$$
⨠ģė°ģ ģ ģ ģ¼ė” ź“ź³āģź° źµ¬ģ± ģģģģ ė°ģķ©ėė¤:
$$n_{b,r} = +\tfrac{1}{\sqrt{2}}, \qquad n_{b',r} = -\tfrac{1}{\sqrt{2}}$$
š« ķ“ģ (ģ§§ģ ģ 리 ķģ)#
벨 ģė°ģ āģź±°ė¦¬ģģģ ģ ė ¹ ź°ģ ģģ©āģ“ ģėėė¤.
ź·øė¤ģ ė¤ģģ źø°ķķģ ģėŖ
ģ
ėė¤:
ė¹ģøģ ė¶ķ“ ź°ė„ķ źµģ°Ø ģź° ź³µėŖ $$t_r$$ģ ė°ė¼.
ģ½ķ = ź³µģ ė ģź°ģ ģ”°ģ, ģ¼ģ¤ ģź°ģ ź±øģ³ ķķė©ėė¤.
