Secure multi-party quantum conference and XOR computation

Quantum conference is a process of securely exchanging messages between three or more parties, using quantum resources. A Measurement Device Independent Quantum Dialogue (MDI-QD) protocol, which is secure against information leakage, has been proposed (Quantum Information Processing 16.12 (2017): 305) in 2017, is proven to be insecure against intercept-and-resend attack strategy. We first modify this protocol and generalize this MDI-QD to a three-party quantum conference and then to a multi-party quantum conference. We also propose a protocol for quantum multi-party XOR computation. None of these three protocols proposed here use entanglement as a resource and we prove the correctness and security of our proposed protocols.

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Experimental demonstration of measurement-device-independent measure of quantum steering

npj Quantum Information ◽

10.1038/s41534-020-00307-9 ◽

2020 ◽

Vol 6 (1) ◽

Author(s):

Yuan-Yuan Zhao ◽

Huan-Yu Ku ◽

Shin-Liang Chen ◽

Hong-Bin Chen ◽

Franco Nori ◽

...

Keyword(s):

Quantum Information ◽

Quantum Information Processing ◽

Entanglement Measure ◽

Experimental Demonstration ◽

Measurement Device ◽

Quantum Steering ◽

Measurement Biases ◽

By Products ◽

Photon Source ◽

Measurement Device Independent

Abstract Within the framework of quantum refereed steering games, quantum steerability can be certified without any assumption on the underlying state nor the measurements involved. Such a scheme is termed the measurement-device-independent (MDI) scenario. Here, we introduce a measure of steerability in an MDI scenario, i.e., the result merely depends on the observed statistics and the quantum inputs. We prove that such a measure satisfies the convex steering monotone. Moreover, it is robust against not only measurement biases but also losses. We also experimentally estimate the amount of the measure with an entangled photon source. As two by-products, our experimental results provide lower bounds on an entanglement measure of the underlying state and an incompatible measure of the involved measurement. Our research paves a way for exploring one-side device-independent quantum information processing within an MDI framework.

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Two efficient measurement device independent quantum dialogue protocols

International Journal of Quantum Information ◽

10.1142/s0219749920500380 ◽

2020 ◽

pp. 2050038

Author(s):

Nayana Das ◽

Goutam Paul

Keyword(s):

Error Estimation ◽

Single Channel ◽

Information Leakage ◽

Quantum Dialogue ◽

Measurement Device ◽

Efficient Measurement ◽

Adversarial Model ◽

Measurement Device Independent

Quantum dialogue is a process of two-way secure and simultaneous communication using a single channel. Recently, a Measurement Device Independent Quantum Dialogue (MDI-QD) protocol has been proposed [A. Maitra, Measurement device independent quantum dialogue,Quantum Inf. Process. 16(12) (2017) 305]. To make the protocol secure against information leakage, the authors have discarded almost half of the qubits remaining after the error estimation phase. In this paper, we propose two modified versions of the MDI-QD protocol such that the number of discarded qubits is reduced to almost one-fourth of the remaining qubits after the error estimation phase. We use almost half of their discarded qubits along with their used qubits to make our protocol more efficient in qubits count. We show that both of our protocols are secure under the same adversarial model given in MDI-QD protocol.

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