Glossary: Difference between revisions

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The last second equation is implied from the fact that for <math>M_i^x</math>, <math>x=0=-0</math>. Thus, X gate has no effect on measurement in X-basis for the given states. Using above notations we express the equation for circuit model of C-NOT from Figure 6 with two inputs and two outputs: Qubits: 1,2,3,4<br/>
The last second equation is implied from the fact that for <math>M_i^x</math>, <math>x=0=-0</math>. Thus, X gate has no effect on measurement in X-basis for the given states. Using above notations we express the equation for circuit model of C-NOT from Figure 6 with two inputs and two outputs: Qubits: 1,2,3,4<br/>
Outcomes: <math>s_1, s_2, s_3, s_4</math><br/>
Outcomes: <math>s_1, s_2, s_3, s_4</math><br/>
Circuit Operation: <math>X^{s_3}_4M_3^xE_{34}E_{13}X_3^{s_2}M_2^xE_{23}</math><br/><div style='text-align: center;'>
Circuit Operation: <math>X^{s_3}_4M_3^xE_{34}E_{13}X_3^{s_2}M_2^xE_{23}</math><br/>
<math>X^{s_3}_4M_3^xE_{34}\mathbf{E_{13}X_3^{s_2}}M_2^xE_{23}&\overset{\text{EX}}{\implies}</math><br/>
<div style='text-align: center;'>
<math>X^{s_3}_4Z_1^{s_2}M_3^x\mathbf{E_{34}X_3^{s_2}}M_2^xE_{13}E_{23}&\overset{\text{EX}}{\implies}</math><br/>
<math>X^{s_3}_4M_3^xE_{34}\mathbf{E_{13}X_3^{s_2}}M_2^xE_{23}\overset{\text{EX}}{\implies}</math><br/>
<math>X^{s_3}_4Z_4^{s_2}Z_1^{s_2}\mathbf{M_3^xX_3^{s_2}}M_2^xE_{13}E_{23}E_{34}&\overset{\text{MX}}{\implies}</math><br/>
<math>X^{s_3}_4Z_1^{s_2}M_3^x\mathbf{E_{34}X_3^{s_2}}M_2^xE_{13}E_{23}\overset{\text{EX}}{\implies}</math><br/>
<math>X^{s_3}_4Z_4^{s_2}Z_1^{s_2}\mathbf{M_3^xX_3^{s_2}}M_2^xE_{13}E_{23}E_{34}\overset{\text{MX}}{\implies}</math><br/>
<math>X^{s_3}_4Z_4^{s_2}Z_1^{s_2}M_3^xM_2^xE_{13}E_{234}</math><br/></div>
<math>X^{s_3}_4Z_4^{s_2}Z_1^{s_2}M_3^xM_2^xE_{13}E_{234}</math><br/></div>
Hence, we obtain a measurement pattern to implement C-NOT gate with a T-shaped graph state with three qubits entangled chain {2,3,4} and 1 entangled to 3. X dependency sets for qubit 1:{s3}, 2:φ, 3:φ, 4:φ. Z dependency sets for qubit 1:{s2}, 2:φ, 3:φ, 4:{s2}. The measurements are independent of any outcome so they can all be performed in parallel. In the end, Pauli corrections are performed as such. Parity (modulo 2 sum) of all the previous outcomes in the dependency set is calculated for each qubit{equation missing} (i), for X (sXi = s1 ⊕ s2 ⊕ ...) and Z (sZi = s1 ⊕ s2 ⊕ ...), separately. Thus, is operated on qubit i.{equation missing} <br/>
Hence, we obtain a measurement pattern to implement C-NOT gate with a T-shaped graph state with three qubits entangled chain <math>\{2,3,4\}</math> and 1 entangled to 3. X dependency sets for qubit <math>1:\{s_3\}</math>, <math>2:\phi</math>, <math>3:\phi</math>, <math>4:\phi</math>. Z dependency sets for qubit <math>1:\{s_2\}</math>, <math>2:\phi</math>, <math>3:\phi</math>, <math>4:\{s_2\}</math>. The measurements are independent of any outcome so they can all be performed in parallel. In the end, Pauli corrections are performed as such. Parity (modulo 2 sum) of all the previous outcomes in the dependency set is calculated for each qubit (i), for X (<math>s^X_i=s_1\oplus s_2\oplus...</math>) and Z (<math>s^Z_i=s_1\oplus s_2\oplus...</math>), separately. Thus, <math>X^{s^X_i}Z^{s^Z_i}</math> is operated on qubit i. <br/>
==References==
==References==
<div style='text-align: right;'>''*contributed by Shraddha Singh''</div>
<div style='text-align: right;'>''*contributed by Shraddha Singh''</div>
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