scholarly journals Information Delay Protocol Using Non-Orthogonal Quantum States

2011 ◽  
Vol 1 ◽  
pp. 178-182
Author(s):  
De Xi Zhang ◽  
Xiao Yu Li
Keyword(s):  
Quantum Mechanics ◽  
Quantum States ◽  
The Other ◽  
Entangled States ◽  
Quantum Operations ◽  
Information Delay

In this paper we provide an information delay protocol using non-orthogonal quantum states. One person can send the other person some information which cannot be read until he or she lets the latter do. The principles of quantum mechanics guarantee that the protocol is unconditionally secure. When the sender decides to let the other get the information, he or she need only to send the latter some dictates through a public classical channel. There are no entangled states and complex quantum operations except measurements needed in our protocol. So it is easier to carry out and more robust in practice.

Information Delay Protocol Using Quantum Entangled States

2011 ◽  
Vol 204-210 ◽  
pp. 1274-1278
Author(s):  
Xiao Yu Li ◽  
De Xi Zhang
Keyword(s):  
Quantum Mechanics ◽  
The Other ◽  
Entangled States ◽  
Information Delay ◽  
Quantum Entangled States ◽  
The One

In this paper we provide a information delay protocol using quantum entangled states. By sharing EPR(Einstain-Rosen-Podolsky) pairs one person can give the other person some information which cannot be read until he or she lets the latter do. The principles of quantum mechanics guarantee that the protocol is unconditionally secure. When the one decides to let the other get the information, he or she need only to send some dictates through a public classical channel. So the protocol is easier to carry out and more robust in practice.

Determined Key Distribution Protocol Using Non-Orthogonal Quantum States

2012 ◽  
Vol 157-158 ◽  
pp. 628-631
Author(s):  
Xiao Yu Li ◽  
Lei Sheng Zhao
Keyword(s):  
Quantum Mechanics ◽  
Key Distribution ◽  
Quantum States ◽  
Entangled States ◽  
Quantum Operations

In this paper we provide an quantum determined key distribution protocol using non-orthogonal quantum states. Two parts can build a key by exchanging some qubits. The principles of quantum mechanics guarantee that the protocol is unconditionally secure. No one except the two parts can get the key. There are no entangled states and complex quantum operations except measurements needed in our protocol. So it is easier to carry out and more robust in practice.

Determined Key Distribution Protocol Using Orthogonal Product States

2013 ◽  
Vol 278-280 ◽  
pp. 1799-1803
Author(s):  
Xiao Yu Li ◽  
Qiu Yu Zhao
Keyword(s):  
Quantum Mechanics ◽  
Key Distribution ◽  
Entangled States ◽  
Quantum Operations ◽  
Orthogonal Product

In this paper we provide a determined key distribution protocol using orthogonal product states in which people can share a predetermined string as the key. The fundamental principles of quantum mechanics guarantee that the protocol is unconditionally secure. There are no entangled states or complex quantum operations needed in our protocol. So it’s easy to carry out in practice and robust against possible noise and attacks.

The Argument from Entanglement

2021 ◽  
pp. 49-79
Author(s):  
Alyssa Ney
Keyword(s):  
Wave Function ◽  
Quantum Mechanics ◽  
Quantum Entanglement ◽  
Structural Realism ◽  
Higher Dimensions ◽  
Quantum States ◽  
Central Issue ◽  
Entangled States ◽  
Field Approach ◽  
Wave Function Realism

In quantum mechanics, entangled states are not exotic or rare. Rather, entanglement is the norm and so the metaphysical consequences of entanglement are a central issue for anyone wishing to provide an ontological interpretation of the various formulations of quantum mechanics. This chapter presents the argument for wave function realism from quantum entanglement, which says that wave function realism is necessary if one wants an ontological interpretation that does not conflate distinct quantum states. It explains quantum entanglement and how postulating a wave function in higher dimensions can help to metaphysically ground the phenomenon. The chapter ultimately concludes that the argument from quantum entanglement fails as there are several rival positions that can also explain quantum entanglement and recover the distinctions between different entangled states. These include the primitive ontology approach, various other holisms, ontic structural realism, spacetime state realism, and the multi-field approach.

ENTANGLEMENT OF FORMATION FOR A CLASS OF SPECIAL QUANTUM STATES

2007 ◽  
Vol 05 (03) ◽  
pp. 343-352 ◽  
Author(s):  
HUI ZHAO ◽  
ZHI-XI WANG
Keyword(s):  
Lower Bound ◽  
Large Class ◽  
Special Kind ◽  
Quantum States ◽  
The Other ◽  
High Dimensional ◽  
Entangled States ◽  
Mixed States ◽  
Density Matrices ◽  
Entanglement Of Formation

The entanglement of formation for a class of high-dimensional quantum mixed states is investigated. A special kind of D-computable states is defined and the lower bound of entanglement of formation for a large class of density matrices whose decompositions lie in these D-computable quantum states is obtained. Moreover we present a kind of construction for this special state which is defined by a class of special matrices with two non-zero different eigenvalues and the other eigenvalues are zero. Making use of the D-computable we construct a class of bound entangled states.

scholarly journals Consequences of preserving reversibility in quantum superchannels

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 441
Author(s):  
Wataru Yokojima ◽  
Marco Túlio Quintino ◽  
Akihito Soeda ◽  
Mio Murao
Keyword(s):  
Quantum Mechanics ◽  
Physical Interpretation ◽  
Quantum Circuit ◽  
Quantum States ◽  
Quantum Circuits ◽  
Causal Order ◽  
Quantum Operations ◽  
Coherent Superposition ◽  
Physical Implementation ◽  
Quantum Objects

Similarly to quantum states, quantum operations can also be transformed by means of quantum superchannels, also known as process matrices. Quantum superchannels with multiple slots are deterministic transformations which take independent quantum operations as inputs. While they are enforced to respect the laws of quantum mechanics, the use of input operations may lack a definite causal order, and characterizations of general superchannels in terms of quantum objects with a physical implementation have been missing. In this paper, we provide a mathematical characterization for pure superchannels with two slots (also known as bipartite pure processes), which are superchannels preserving the reversibility of quantum operations. We show that the reversibility preserving condition restricts all pure superchannels with two slots to be either a quantum circuit only consisting of unitary operations or a coherent superposition of two unitary quantum circuits where the two input operations are differently ordered. The latter may be seen as a generalization of the quantum switch, allowing a physical interpretation for pure two-slot superchannels. An immediate corollary is that purifiable bipartite processes cannot violate device-independent causal inequalities.

High-Security Information Delay Scheme Based on Entangled States and Quantum Teleportation Technology

2013 ◽  
Vol 791-793 ◽  
pp. 1646-1650
Author(s):  
Qiu Yu Zhao ◽  
Xiao Yu Li
Keyword(s):  
Quantum Teleportation ◽  
Quantum Physics ◽  
High Capacity ◽  
The Other ◽  
Unconditional Security ◽  
Entangled States ◽  
High Security ◽  
Information Delay ◽  
Security Information ◽  
The One

In this paper we provide a high-capacity information delay scheme based on eantangled states and quantum teleportation technology. By sharing EPR (Einstain-Rosen-Podolsky) pairs, one person can give the other person some information which cannot be read until he or she lets the latter do. By virtue of quantum teleportation technology, no one can gain more information about the key than guessing the key at random. So the scheme can gain high security. The fundamental principles of quantum physics guarantee its unconditional security. When the one decides to let the other get the information, he or she need only to send some dictates through a public classical channel. So the scheme is easier to carry out and more robust in practice.

Quantum Information Delay Protocol Using Entanglement Swapping

2012 ◽  
Vol 569 ◽  
pp. 657-661
Author(s):  
Xiao Yu Li ◽  
Wei Mei Zhi
Keyword(s):  
Quantum Mechanics ◽  
Quantum Information ◽  
Entanglement Swapping ◽  
The Other ◽  
Bell States ◽  
Other Hand ◽  
Information Delay ◽  
The One

In this paper we provide a quantum information delay protocol using entanglement swapping. By sharing Bell states one person can give the other person some information which cannot be read until he or she lets the latter do. The principles of quantum mechanics guarantee that the protocol is unconditionally secure. When the one decides to let the other get the information, he or she needs only to send some dictates through a public classical channel. So the protocol is easier to carry out and more robust in practice. On the other hand it can be more efficient and more secure than previous protocols.

“Non-locality”

2017 ◽  
Author(s):  
Richard Healey
Keyword(s):  
Quantum Theory ◽  
Quantum Entanglement ◽  
Quantum States ◽  
Entangled States ◽  
Entangled Quantum States ◽  
Action At A Distance ◽  
Insight Into ◽  
Non Locality

Quantum entanglement is popularly believed to give rise to spooky action at a distance of a kind that Einstein decisively rejected. Indeed, important recent experiments on systems assigned entangled states have been claimed to refute Einstein by exhibiting such spooky action. After reviewing two considerations in favor of this view I argue that quantum theory can be used to explain puzzling correlations correctly predicted by assignment of entangled quantum states with no such instantaneous action at a distance. We owe both considerations in favor of the view to arguments of John Bell. I present simplified forms of these arguments as well as a game that provides insight into the situation. The argument I give in response turns on a prescriptive view of quantum states that differs both from Dirac’s (as stated in Chapter 2) and Einstein’s.

Quantum Theory

2017 ◽  
Author(s):  
Frank S. Levin
Keyword(s):  
Quantum Mechanics ◽  
Quantum Theory ◽  
Uncertainty Principle ◽  
Quantum Spin ◽  
Quantum States ◽  
Wave Functions ◽  
Symbolic Representations ◽  
Quantum Numbers ◽  
The Subject ◽  
Heisenberg's Uncertainty Principle

The subject of Chapter 8 is the fundamental principles of quantum theory, the abstract extension of quantum mechanics. Two of the entities explored are kets and operators, with kets being representations of quantum states as well as a source of wave functions. The quantum box and quantum spin kets are specified, as are the quantum numbers that identify them. Operators are introduced and defined in part as the symbolic representations of observable quantities such as position, momentum and quantum spin. Eigenvalues and eigenkets are defined and discussed, with the former identified as the possible outcomes of a measurement. Bras, the counterpart to kets, are introduced as the means of forming probability amplitudes from kets. Products of operators are examined, as is their role underpinning Heisenberg’s Uncertainty Principle. A variety of symbol manipulations are presented. How measurements are believed to collapse linear superpositions to one term of the sum is explored.

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