| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a quantum computing method using an optical resonator, wherein a multiple quantum bit gate can be executed. <P>SOLUTION: (N+1) physical systems (which have five energy levels ¾0>, ¾1>, ¾2>, ¾3>, and ¾4>, and in which quantum bits are expressed by ¾0>, ¾1>), are disposed in an optical resonator having a resonator mode resonating with transition frequencies (substantially identical in each physical system) of ¾2> and ¾3>, N control systems and one target system are prepared, the target system is irradiated with an optical pulse resonating with ¾0> and ¾4>, ¾1> and ¾4>, ¾2> and ¾4>, the superposition state ¾c> of the target system is made to change into ¾2>, all the (N+1) physical systems are irradiated with an optical pulse resonating ¾0> and ¾3> and an optical pulse resonating ¾1> and ¾3>, the phase of the resonating optical pulse with which the target system is irradiated is shifted by a specified value depending on unitary transformation U while the control systems are irradiated with the resonating optical pulse, and the target system is irradiated with optical pulses which resonates with ¾0> and ¾4>, ¾1> and ¾4>, ¾2> and ¾4> and whose phase difference therebetween are set to be specified values depending on the unitary transformation to return ¾2> to ¾c>. Thus, multi-control unitary gate is executed. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
