Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:1609.06215

On the local discrimination of quantum measurements

You-Bang Zhan

Published Sep 20, 2016• 0 citations
arXivHTMLPDF

Abstract

The discrimination of quantum measurements is an important subject of quantum information processes. In this paper we present a novel protocol for local quantum measurement discrimination with multi-qubit entanglement systems. It is shown that, in the case of Bob did not know Alice's result of measurement, if both two observers (Alice and Bob) agreed in advance that Alice should measure her qubits before an appointed time t, the local discrimination of two different kinds of measurement can be completed via numerous eight-qubit GHZ entangled states and selective projective measurement.

DOI
10.48550/arxiv.1609.06215

Related papers

Violation of the no-signaling constraint by using local discrimination of quantum measurements

You-bang Zhan

Abstract The discrimination of quantum measurements is an important aspect of quantum information processes. In this paper we present a novel protocol for local quantum measurement discrimination (LQMD) via selective projective measurements with numerous multi-qubit GHz entangled states. In this protocol, we assume that there is no classical channel between two space-like separated parties (Alice and Bob). To ensure that their operations proceed in an orderly fashion they agree that Alice measures her qubits before a specified time while Bob measures his after this time. Furthermore, a method for comparing measurement results is employed, that is, after Alice’s measurement, Bob does not calculate the reduced density matrix of his system but compares the probability of all his qubits being in states | 0 ⟩ or | 1 ⟩ after measuring his qubits under the basis { | 0 ⟩ , | 1 ⟩ } . It is shown that after this the local discrimination of two different kinds of measurement can be completed via numerous eight-qubit GHz entangled states and selective projective measurements without the help of classical information. This means that that no-signaling constraint can be violated by LQMD.

Laser Physics Letters•Dec 1, 2025•0 citations

Violation of no-Signaling Via Local Quantum Measurement Discrimination

Youbang Zhzn

The discrimination of quantum measurements is an important subject of quantum information processes. In this paper we present a novel protocol for local quantum measurement discrimination (LQMD) with multi-qubit entanglement systems. It is shown that, for two space-like separated parties, the local discrimination of two different kinds of measurement can be completed via numerous eight-qubit GHZ entangled states and selective projective measurements without help of classical information. This means that no-signaling constraint can be violated by the LQMD.

•Sep 1, 2016•0 citations

Violation of no-Signaling Constraint by Local Quantum Measurement Discrimination with Numerous Eight-Qubit Entangld States

You-Bang Zhan

The discrimination of quantum measurements is an important subject of quantum information processes. In this paper we present a novel protocol for local quantum measurement discrimination (LQMD) with multi-qubit entanglement systems. It is shown that, for two spacelike separated parties, the local discrimination of two different kinds of measurement can be completed via numerous eight-qubit GHZ entangled states and selective projective measurements without help of classical information. This means that no-signaling constraint can be violated by the LQMD.

•May 1, 2016•0 citations

Local quantum measurement discrimination without assistance of classical communication

You-Bang Zhan

The discrimination of quantum operations is an important subject of quantum information processes. For the local distinction, existing researches pointed out that, since any operation performed on a quantum system must be compatible with no-signaling constraint, local discrimination between quantum operations of two spacelike separated parties cannot be realized. We found that, however, local discrimination of quantum measurements may be not restricted by the no-signaling if more multi-qubit entanglement and selective measurements were employed. In this paper we report that local quantum measurement discrimination (LQMD) can be completed via selective projective measurements and numerous seven-qubit GHZ states without help of classical communication if both two observers agreed in advance that one of them should measure her/his qubits before an appointed time. As an application, it is shown that the teleportation can be completed via the LQMD without classical information. This means that the superluminal communication can be realized by using the LQMD.

•Apr 1, 2015•0 citations

Violation of no-Signaling Constraint by Distinguishing Local Quantum Measurement with Numerous Eight-Particle GHZ States

You-Bang Zhan

The distinction of quantum measurements is one of the fundamentally important problems in quantum information science. In this paper we present a novel protocol for distinguishing local quantum measurement (DLQM) with multi-particle entanglement systems. It is shown that, for two spacelike separated parties, the local discrimination of two different kinds of measurement can be completed via numerous eight-particle GHZ entangled states and selective projective measurements without help of classical information. This means that no-signaling constraint can be violated by the DLQM.

•Apr 1, 2016•0 citations

Extracting Information from a Qubit by Multiple Observers: Toward a Theory of Sequential State Discrimination

János A. Bergou, Edgar Feldman, Mark S. Hillery

We discuss sequential unambiguous state-discrimination measurements performed on the same qubit. Alice prepares a qubit in one of two possible states. The qubit is first sent to Bob, who measures it, and then on to Charlie, who also measures it. The object in both cases is to determine which state Alice sent. In an unambiguous state discrimination measurement, we never make a mistake, i.e., misidentify the state, but the measurement may fail, in which case we gain no information about which state was sent. We find that there is a nonzero probability for both Bob and Charlie to identify the state, and we maximize this probability. The probability that Charlie's measurement succeeds depends on how much information about the state Alice sent is left in the qubit after Bob's measurement, and this information can be quantified by the overlap between the two possible states in which Bob's measurement leaves the qubit. This Letter is a first step toward developing a theory of nondestructive sequential quantum measurements, which could be useful in quantum communication schemes.

arXiv:1305.4290•Physical Review Letters•Sep 3, 2013•70 citations
The discrimination of quantum measurements is an important subject of quantum information processes. In this paper we present a novel protocol for local quantum measurement discrimination with multi-qubit entanglement systems. It is shown that, in the case of Bob did not know Alice's result of measurement, if both two observers (Alice and Bob) agreed in advance that Alice should measure her qubits before an appointed time t, the local discrimination of two different kinds of measurement can be completed via numerous eight-qubit GHZ entangled states and selective projective measurement.
Abstract The discrimination of quantum measurements is an important aspect of quantum information processes. In this paper we present a novel protocol for local quantum measurement discrimination (LQMD) via selective projective measurements with numerous multi-qubit GHz entangled states. In this protocol, we assume that there is no classical channel between two space-like separated parties (Alice and Bob). To ensure that their operations proceed in an orderly fashion they agree that Alice measures her qubits before a specified time while Bob measures his after this time. Furthermore, a method for comparing measurement results is employed, that is, after Alice’s measurement, Bob does not calculate the reduced density matrix of his system but compares the probability of all his qubits being in states | 0 ⟩ or | 1 ⟩ after measuring his qubits under the basis { | 0 ⟩ , | 1 ⟩ } . It is shown that after this the local discrimination of two different kinds of measurement can be completed via numerous eight-qubit GHz entangled states and selective projective measurements without the help of classical information. This means that that no-signaling constraint can be violated by LQMD.
The discrimination of quantum measurements is an important subject of quantum information processes. In this paper we present a novel protocol for local quantum measurement discrimination (LQMD) with multi-qubit entanglement systems. It is shown that, for two space-like separated parties, the local discrimination of two different kinds of measurement can be completed via numerous eight-qubit GHZ entangled states and selective projective measurements without help of classical information. This means that no-signaling constraint can be violated by the LQMD.
The discrimination of quantum measurements is an important subject of quantum information processes. In this paper we present a novel protocol for local quantum measurement discrimination (LQMD) with multi-qubit entanglement systems. It is shown that, for two spacelike separated parties, the local discrimination of two different kinds of measurement can be completed via numerous eight-qubit GHZ entangled states and selective projective measurements without help of classical information. This means that no-signaling constraint can be violated by the LQMD.
The discrimination of quantum operations is an important subject of quantum information processes. For the local distinction, existing researches pointed out that, since any operation performed on a quantum system must be compatible with no-signaling constraint, local discrimination between quantum operations of two spacelike separated parties cannot be realized. We found that, however, local discrimination of quantum measurements may be not restricted by the no-signaling if more multi-qubit entanglement and selective measurements were employed. In this paper we report that local quantum measurement discrimination (LQMD) can be completed via selective projective measurements and numerous seven-qubit GHZ states without help of classical communication if both two observers agreed in advance that one of them should measure her/his qubits before an appointed time. As an application, it is shown that the teleportation can be completed via the LQMD without classical information. This means that the superluminal communication can be realized by using the LQMD.
The distinction of quantum measurements is one of the fundamentally important problems in quantum information science. In this paper we present a novel protocol for distinguishing local quantum measurement (DLQM) with multi-particle entanglement systems. It is shown that, for two spacelike separated parties, the local discrimination of two different kinds of measurement can be completed via numerous eight-particle GHZ entangled states and selective projective measurements without help of classical information. This means that no-signaling constraint can be violated by the DLQM.
We discuss sequential unambiguous state-discrimination measurements performed on the same qubit. Alice prepares a qubit in one of two possible states. The qubit is first sent to Bob, who measures it, and then on to Charlie, who also measures it. The object in both cases is to determine which state Alice sent. In an unambiguous state discrimination measurement, we never make a mistake, i.e., misidentify the state, but the measurement may fail, in which case we gain no information about which state was sent. We find that there is a nonzero probability for both Bob and Charlie to identify the state, and we maximize this probability. The probability that Charlie's measurement succeeds depends on how much information about the state Alice sent is left in the qubit after Bob's measurement, and this information can be quantified by the overlap between the two possible states in which Bob's measurement leaves the qubit. This Letter is a first step toward developing a theory of nondestructive sequential quantum measurements, which could be useful in quantum communication schemes.