Qubit error rate of QKD BB84 protocol

In summary, the conversation discusses the measurement of Quantum Bit Error Rate (QBER) in the BB84 protocol during key distribution. The QBER is the percentage or probability of bit error in the quantum channel and can be calculated by taking the length of erroneous bits divided by the length of the raw key. In this protocol, if an eavesdropper intercepts every qubit, the QBER is 25%. The calculation for this is ½(0) + ½(½) = ¼, meaning that half of the time, the eavesdropper would use the correct basis, and the other half, she would use it wrongly. Half of that time, where she used it wrongly, she would be discovered,
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Pattarasak
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Hello everyone, I don't know how to measure the QBER of BB84 protocol in a realistic experiment.In the most paper show the data which is only the number but do not show the unit of data, what is the unit of these data?
 
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The Quantum Bit Error Rate (QBER) is the measurement of the percentage or probability of bit error across the quantum channel during key distribution. After obtaining the raw key, QBER can be calculated by taking the length of erroneous bits divided by length of raw key. In BB84 protocol, if an Eve intercept every qubits, QBER is 25%. How to calculate: ½(0) + ½(½) = ¼. (simply means half of the time, Eve would have use the correct basis, other half, she would use wrongly and half of that time where she used it wrongly, Eve would be discovered and that is reflected in QBER.
 
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1. What is a qubit error rate in the context of QKD BB84 protocol?

The qubit error rate refers to the rate at which errors occur in the transmission and measurement of qubits in the BB84 protocol for quantum key distribution (QKD). This can be caused by various factors such as noise in the communication channel, imperfections in the hardware, or eavesdropping attempts.

2. How is the qubit error rate measured in QKD BB84 protocol?

The qubit error rate is typically measured by comparing the expected outcomes of the qubit measurements with the actual outcomes. This can be done during the key generation phase or through error correction protocols. The lower the qubit error rate, the more secure the key generated through QKD will be.

3. What is considered an acceptable qubit error rate in QKD BB84 protocol?

An acceptable qubit error rate in QKD BB84 protocol depends on the specific implementation and security requirements. Generally, a qubit error rate of less than 1% is considered secure for most applications. However, for more sensitive data, a lower error rate may be required.

4. How can qubit error rate be reduced in QKD BB84 protocol?

There are several techniques that can help reduce the qubit error rate in QKD BB84 protocol. These include using error correction codes, implementing quantum error correction techniques, using higher quality hardware, and optimizing the communication channel to reduce noise and interference.

5. How does qubit error rate affect the security of QKD BB84 protocol?

The qubit error rate directly affects the security of QKD BB84 protocol as it can lead to errors in the generated key. A higher error rate increases the chances of an eavesdropper intercepting and decoding the key, compromising its security. Therefore, it is important to keep the qubit error rate as low as possible in QKD BB84 protocol to ensure the security of the key exchange.

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