Using a two-level atom as a quantum bit, We have studied the decoherent properties of the single quantum bit model in a thermal reservoir and the intensity dependent coupling Jaynes-Cummings model by calculating the non-oposite angle elements of the reduced density matrix of the intraction system,respectively.
The time evolution properites of non opposite angle element of atoms reducible density rectangular array can reflect quantum bits decoherence when the two level atom is regarded as quantum bit in quantum computation.
Firstly the binding energies and the ground state energies of Hydrogen impurity in a lens-shaped quantum dot (GaAs/Inl-xGaxAs) under vertical magnetic field will be displayed. Then how to use the nuclear spin as the quantum bit will be given.
In order to understand it clearly and completely,in this paper we discuss some problems about quantum information security,such as quantum key distribution,quantum identification,quantum digital signature,and quantum bit commitment. Also,we present the trends and new developments.
It is found that the total spin of ground state of this system could be modulated by changing the magnitude of the magnetic field,which means the two spin states with S =0,1 of a two electron two dimensional quantum dot confined by a finite height parabolic potential can be used to construct a quantum bit.
Cavity quantum electrodynamics is an important mesas to realize quantum information, and it is also the system that obtain Deterministic multi-particle entanglement. Using Cavity quantum electrodynamics system can achieve the conversion between atomic quantum bit and photon quantum bit.
A scheme for entangling such polaritons has been considered, and small-diameter metallic nanotubes have been shown to result in sizable amounts of the two-quantum bit (qubit) atomic entanglement with no damping for sufficiently long times.
Realization of a spin-based quantum bit proposal in a lateral quantum dot is discussed.
In this paper we show that a method for keeping two classical bits hidden in any such scenario can be used to construct a method for keeping one quantum bit hidden, and vice-versa.
The quantum bit commitment theorem is reviewed here and the central conceptual point, that an "Einstein-Podolsky-Rosen" attack or cheating strategy can always be applied, is clarified.
This paper discusses the properties of Quantum bit (Qubit) and Quantum logic gates (Quantum not-gate, Hadamard gate and Quantum controlled not-gate etc.) by the generating element of Pauli algebra (Clifford algebra Cl3).
In this paper,the concepts of quantum computation(e. g. quantum bit,quantum logic gate,decoherence et al)are gived in detail. Recent progress in quantum computation is briefly reviewed.
Quantum information and computing now is the hot research field of physics.In this paper we briefly introduce some basic concepts of quantum computing which include quantum entanglement,quantum bit,quantum register,quantum parallel computing and quantum error correction.Also,introduce two typical quantum information technology:quantum cryptography and quantum teleportation.
This paper briefly introduces the principles and merits of the superconductivie computer, light computer and quantum computer and discusses some basic concepts of quantum computting which includes quantum superposition, quantum entanglement,quantum bit and quantum logic gates