Research Article
A Quantum-Based Database Query Scheme for Privacy Preservation in Cloud Environment
Table 1
Key notations and descriptions involved in proposed QBDQ scheme.
| Notation | Description |
| | The number of items in cloud server’s database | | The cloud server’s database, | | The i-th data in | | The number of index qubits used to encode index of data items | | The number of qubits used to encode data | | The index of client Alice’s query data | | The data item Alice wants to query from | | The index of client Bob’s query data | | The data item Bob wants to query from | | The offset value of Alice | | The offset value of Bob | | The encryption key sequence belongs to Charlie, . | | The oracle operation to encode Charlie’s key sequence | | The oracle operation to encode Alice’s query result | | The oracle operation to encode Bob’s query result | | The oracle operation which conditionally changes the sign in the amplitudes of the query item () | | The oracle operation which perform a conditional phase shift of -1 with every computational bass state except |
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