scholarly journals Harnessing the Exchange Interaction for Quantum Information Processing

2018 ◽  
Author(s):  
Mrittunjoy Guha Majumdar
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Exchange Interaction ◽  
Quantum Communication ◽  
Quantum Information Processing ◽  
Invariant Subspaces ◽  
Permutation Symmetry ◽  
Physical Systems ◽  
Definition Of ◽  
Swap Operator

In this paper, I propose new models of quantum information processing using the exchange interaction in physical systems. The partial SWAP operator that can be realized using the exchange interaction is used as the underlying resource for defining models of quantum computation, quantum communication, quantum memory and decoherence-free subspaces. Given the non-commutativity of these operators (for adjacent operators operating on a common qubit), a number of quantum states and entanglement patters can be obtained. This zoo of states can be classified, due to the parity constraints and permutation symmetry of the states, into invariant subspaces that are used for the definition of some of the applications in this paper.

On the classical character of control fields in quantum information processing

2002 ◽  
Vol 2 (1) ◽  
pp. 1-13
Author(s):  
S.J. van Enk ◽  
H.J. Kimble
Keyword(s):  
Quantum Computing ◽  
Information Processing ◽  
Quantum Information ◽  
Laser Beam ◽  
Quantum State ◽  
Quantum Communication ◽  
Quantum Information Processing ◽  
Laser Fields ◽  
Undesirable Property

Control fields in quantum information processing are almost by definition assumed to be classical. In reality, however, when such a field is used to manipulate the quantum state of qubits, the qubits always become slightly entangled with the field. For quantum information processing this is an undesirable property, as it precludes perfect quantum computing and quantum communication. Here we consider the interaction of atomic qubits with laser fields and quantify atom-field entanglement in various cases of interest. We find that the entanglement decreases with the average number of photons \bar{n} in a laser beam as $E\propto\log_2 \bar{n}/\bar{n}$ for $\bar{n}\rightarrow\infty$.

scholarly journals PROBLEMS AND PROSPECTS OF CREATION OF QUANTUM COMMUNICATION SYSTEMS

2020 ◽  
pp. 27-33
Author(s):  
I.I. Ryabtsev ◽  
S.P. Yurkevichyus ◽  
A.E. Gritsenko
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Communication Systems ◽  
Quantum Communication ◽  
Quantum Information Processing ◽  
Scientific Research ◽  
The State ◽  
Processing Technology

Scientific and technological problems and prospects for creating quantum communication systems are herein outlined. A brief analysis of the state of scientific research in this area abroad is carried out. The strengths and weaknesses of the implementation of quantum information processing technology are reflected.

scholarly journals ENTANGLEMENT OF IDENTICAL PARTICLES AND REFERENCE PHASE UNCERTAINTY

2003 ◽  
Vol 01 (04) ◽  
pp. 427-441 ◽  
Author(s):  
JOHN A. VACCARO ◽  
FABIO ANSELMI ◽  
HOWARD M. WISEMAN
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Invariant Subspaces ◽  
Bipartite Entanglement ◽  
Identical Particles ◽  
Phase Uncertainty ◽  
Reference Phase

We have recently introduced a measure of the bipartite entanglement of identical particles, E P , based on the principle that entanglement should be accessible for use as a resource in quantum information processing. We show here that particle entanglement is limited by the lack of a reference phase shared by the two parties, and that the entanglement is constrained to reference-phase invariant subspaces. The super-additivity of E P results from the fact that this constraint is weaker for combined systems. A shared reference phase can only be established by transferring particles between the parties, that is, with additional nonlocal resources. We show how this nonlocal operation can increase the particle entanglement.

Quantum Information Processing

2001 ◽  
Author(s):  
David P. DiVincenzo ◽  
Charles H. Bennett
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing
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