| 摘要 |
<P>PROBLEM TO BE SOLVED: To generate a plurality of quantum bits in desired entanglement states while suppressing influence of loss, using a probabilistic gate. <P>SOLUTION: A method includes performing X measurement of one quantum bit contained in a first quantum bit set consisting of three or more quantum bits in an entanglement state, to generate a second quantum bit set in a quantum state: ¾η<SB POS="POST">1</SB>>¾Φ<SB POS="POST">1</SB>>¾Φ<SB POS="POST">3</SB>>¾η<SB POS="POST">3</SB>>+¾η<SB POS="POST">2</SB>>¾Φ<SB POS="POST">2</SB>>¾Φ<SB POS="POST">4</SB>>¾η<SB POS="POST">4</SB>>. To the quantum state and a quantum state of a third quantum bit set: ¾η<SB POS="POST">51</SB>>¾Φ<SB POS="POST">5</SB>>¾η<SB POS="POST">52</SB>>+¾η<SB POS="POST">61</SB>>¾Φ<SB POS="POST">6</SB>>¾η<SB POS="POST">62</SB>>, a quantum operation is applied represented by the relation: γ<SB POS="POST">1</SB><Φ<SB POS="POST">3</SB>¾<Φ<SB POS="POST">5</SB>¾+γ<SB POS="POST">2</SB><Φ<SB POS="POST">4</SB>¾<Φ<SB POS="POST">6</SB>¾, to generate a fourth quantum bit set in a quantum state: ¾η<SB POS="POST">71</SB>>¾Φ<SB POS="POST">1</SB>>¾η<SB POS="POST">72</SB>>+¾η<SB POS="POST">81</SB>>¾Φ<SB POS="POST">2</SB>>¾η<SB POS="POST">82</SB>>, which is in an entanglement state. <P>COPYRIGHT: (C)2013,JPO&INPIT |
