Quantum Privacy Amplification for a Sequence of Single Qubits
Quantum Privacy Amplification for a Sequence of Single Qubits
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DOI：
10.1088/0253-6102/46/3/013
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发表时间：
2006-09
影响因子：
3.1
通讯作者：
Fu-Guo Deng;Gui-Lu Long
中科院分区：
文献类型：
--
作者：
Fu-Guo Deng;Gui-Lu Long
我们提出了一种针对一系列单量子位的量子隐私放大（QPA）方案。 QPA 过程使用具有两个受控非门和一个 Hadamard 门的酉运算。每两个量子位都执行酉门操作，并对一个光子进行测量，并保留另一个光子。保留的量子位携带了丢弃的量子位的状态信息。这样，就减少了信息泄露。该过程可以重复执行，从而将信息泄漏减少到任意低的水平。通过该QPA方案，可以实现任意高安全性的单个量子比特的量子安全直接通信。我们还利用该方案对量子信息共享中的单个量子位进行隐私放大，以便与量子中继器进行长距离通信。
We present a scheme for quantum privacy amplification (QPA) for a sequence of single qubits. The QPA procedure uses a unitary operation with two controlled-not gates and a Hadamard gate. Every two qubits are performed with the unitary gate operation, and a measurement is made on one photon and the other one is retained. The retained qubit carries the state information of the discarded one. In this way, the information leakage is reduced. The procedure can be performed repeatedly so that the information leakage is reduced to any arbitrarily low level. With this QPA scheme, the quantum secure direct communication with single qubits can be implemented with arbitrarily high security. We also exploit this scheme to do privacy amplification on the single qubits in quantum information sharing for long-distance communication with quantum repeaters.