Quantum communication and measurement

V. P. Belavkin, Osamu Hirota, R. L. Hudson

Renzhi Yuan

This paper gives a brief introduction to Positive-Operator Valued Measure (POVM) of quantum communications. The Projection-Valued Measure (PVM) is first introduced and then the POVM. The relation between POVM and PVM is discussed and an example of POVM in practical measurement is given. This paper provides some insight of POVM measurement for quantum communications.

Michael J. Zwerger, Hans J. Briegel, Wolfgang Dür

寇召飞 Kou Zhaofei, Xinrong Mao

The entanglement properties of the quantum channel in quantum communication did not play well, in order to realize quantum communication at superluminal speed with the help of this entanglement property, a kind of quantum communication mode which can measure the change of quantum information is proposed in this article. This method can bypass the classical channel part in the quantum communication. In the concrete realization process, by combining the quantum weak measurement method, information transmission can be carried out without destroying entangled states, so as to achieve superluminal communication.

Stephen Mark Barnett, Erika Andersson, John Jeffers +2 more

Tanumoy Pramanik, Dong-Hwa Lee, Young‐Wook Cho +6 more

Multiparty quantum communication provides delightful applications, including quantum cryptographic communication and quantum secret sharing. Quantum communication based on the Greenberg-Horne-Zeilinger (GHZ) state measurement provides a practical way to implement multiparty quantum communication. With the standard spatially localized GHZ state measurement, however, information can be imbalanced among the communication parties that can cause significant problems in some applications of multiparty cryptographic communication, e.g., secret sharing. Here, we propose an equitable multiparty quantum communication where information balance among the communication parties is achieved without a trusted third party. Our scheme is based on the GHZ state measurement that is not spatially localized but implemented in a way that all the distant communication parties symmetrically participate. We also verify the feasibility of our scheme by presenting the proof-of-principle experimental demonstration of informationally balanced three-party quantum communication using weak coherent pulses.