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4.3 Quantum Scheduling Algorithm<br />

|J1 (m+q) ><br />

|J2 (m+q) ><br />

|JN-1 (m+q) ><br />

|JN (m+q) ><br />

.<br />

.<br />

.<br />

|0 (M(n+q)) ><br />

4.3.1 Information Encoding<br />

.<br />

.<br />

.<br />

Ω<br />

|0 (n+q) ><br />

∆<br />

.<br />

.<br />

.<br />

.<br />

.<br />

.<br />

S (N(m+q))<br />

T (M(n+q))<br />

Cmax (n+q)<br />

Figure 4.1: A quantum circuit to prepare the makespan vector<br />

Let Ω be an operator which given a schedule constructs the running time on each machine<br />

for that schedule. When applied to the equal superposition of all schedules, it produces a<br />

superposition of the running time | T 〉 on each machine for all schedules:<br />

| ����<br />

ST 〉 = Ω(| S〉 | 0〉).<br />

where, | ����<br />

ST 〉 denotes an entangled state of S and T , while the tensor product of S and<br />

T is | ST 〉. Let ∆ be an operator which computes a superposition of the makespan of all<br />

49

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