Using the non-Hermitian operation approach, the enhanceable capacity of quantum dense coding can be realized in the quantum spin chain channel. We derive the exact analytical expressions of the quantum dense coding an...
详细信息
Using the non-Hermitian operation approach, the enhanceable capacity of quantum dense coding can be realized in the quantum spin chain channel. We derive the exact analytical expressions of the quantum dense coding and in detail investigate the influence of non-Hermitian operator parameters on the quantum dense coding. We find that the non-Hermitian operator process can obviously enhance the quantum dense coding. In particular, we show that the optimal capacity of quantum dense coding can always be larger than 1 with the assistance of non-Hermitian operations.
In this work, we investigate the effect of a parity-time ( PT) symmetric operation on the dynamic behavior of quantum dense coding for a two-qubit system in non-Markovian environments. First, we derive the explicit ex...
详细信息
In this work, we investigate the effect of a parity-time ( PT) symmetric operation on the dynamic behavior of quantum dense coding for a two-qubit system in non-Markovian environments. First, we derive the explicit expressions of quantum dense coding for an exactly solving model consisting of two qubits interacting with an independent structured reservoir. Then, we give two cases, i.e. resonant and off-resonant regimes, to demonstrate the performance of the PT symmetric operation on quantum dense coding dynamics. By investigation, we find that the capacity of quantum dense coding can be obviously enhanced with the assistance of the PT symmetric operation in different regimes. In addition, we show that the optimal local PT symmetric operation can completely protect quantum dense coding. The obtained results imply that the PT symmetric operation method may have potential applications in quantum decoherence control.
A protocol of quantum dense coding with gravitational cat states is *** explore the effects of temperature and system parameters on densecoding capacity and provide an efficient strategy to preserve the quantum advan...
详细信息
A protocol of quantum dense coding with gravitational cat states is *** explore the effects of temperature and system parameters on densecoding capacity and provide an efficient strategy to preserve the quantum advantage of densecoding for these *** results may open new opportunities for secure communication and insights into the fundamental nature of gravity in the context of quantum information processing.
quantum dense coding of continuous variables via a two-mode squeezed vacuum state is considered for a noisy quantum channel. Classical information is encoded in the two quadrature components of one mode of a two-mode ...
详细信息
quantum dense coding of continuous variables via a two-mode squeezed vacuum state is considered for a noisy quantum channel. Classical information is encoded in the two quadrature components of one mode of a two-mode squeezed vacuum state and the encoded mode is sent through a noisy quantum channel which is assumed to be linearly dissipative. Decoding at the receiver side is performed by simultaneous measurement of two quadrature components of the two-mode state. By calculating the error probability of a binary communication system, we examine whether the densecoding is effective or not when a quantum channel is noisy.
We propose two schemes for quantum dense coding without Bell states measurement. One is deterministic, the other is probabilistic. In the deterministic scheme, the initial entangled state will be not destructed. In th...
详细信息
We propose two schemes for quantum dense coding without Bell states measurement. One is deterministic, the other is probabilistic. In the deterministic scheme, the initial entangled state will be not destructed. In the proba-bilistic scheme, the initial unknown nonmaximal entangled state will be transformed into a maximal entangled one. Our schemes require two auxiliary particles and perform single-qubit measurements on them. Thus our schemes are simple and economic.
By taking into account the nonuniform magnetic field, the quantum dense coding with thermal entangled states of a two-qubit anisotropic Heisenberg XYZ chain are investigated in detail. We mainly show the different pro...
详细信息
By taking into account the nonuniform magnetic field, the quantum dense coding with thermal entangled states of a two-qubit anisotropic Heisenberg XYZ chain are investigated in detail. We mainly show the different properties about the densecoding capacity (chi) with the changes of different parameters. It is found that densecoding capacity chi can be enhanced by decreasing the magnetic field B, the degree of inhomogeneity b and temperature T, or increasing the coupling constant along z-axis J (z) . In addition, we also find chi remains the stable value as the change of the anisotropy of the XY plane Delta in a certain temperature condition. Through studying different parameters effect on chi, it presents that we can properly turn the values of B, b, J (z) , Delta or adjust the temperature T to obtain a valid densecoding capacity (chi satisfies chi > 1). Moreover, the temperature plays a key role in adjusting the value of densecoding capacity chi. The valid densecoding capacity could be always obtained in the lower temperature-limit case.
Following a recent proposal (Phys. Lett. A 346 (2005) 330) about quantum dense coding using a tripartite entangled GHZ state and W state, this paper proposes an experimentally feasible scheme for densecoding in cavit...
详细信息
Following a recent proposal (Phys. Lett. A 346 (2005) 330) about quantum dense coding using a tripartite entangled GHZ state and W state, this paper proposes an experimentally feasible scheme for densecoding in cavity QED by using another peculiar tripartite entangled state. In the scheme the atoms interact simultaneously with a highly detuned cavity mode with the assistance of a classical field, the successful probability of densecoding scheme with this peculiar tripartite entangled state equals 1.
We demonstrate a four-qubit cluster state can be used to realize quantum dense coding in trapped ions. The scheme does not involve Bell-state measurement. Thus it is insensitive to the thermal motion, which is of impo...
详细信息
We demonstrate a four-qubit cluster state can be used to realize quantum dense coding in trapped ions. The scheme does not involve Bell-state measurement. Thus it is insensitive to the thermal motion, which is of importance in view of experiment. Meanwhile, the successful probability can both reach 1.0. The protocol is simple and easy to be fulfilled in the experiment. These property of the schemes can be utilized to construct a controlled quantum channel, which may be useful in the future quantum computation.
We propose an experimentally feasible scheme for implementing quantum dense coding by using a genuine four-atom entangled state in cavity QED. In cavity QED, we have demonstrated that such a four-atom entangled states...
详细信息
We propose an experimentally feasible scheme for implementing quantum dense coding by using a genuine four-atom entangled state in cavity QED. In cavity QED, we have demonstrated that such a four-atom entangled states can be exactly distinguished, and thus this scheme can be realized with present cavity QED techniques.
We investigate quantum dense coding based on entangled Bell states in cavity QED. We implement a experimentally feasible new scheme in cavity QED with atomic qubits where the atoms interact with a highly detuned cavit...
详细信息
We investigate quantum dense coding based on entangled Bell states in cavity QED. We implement a experimentally feasible new scheme in cavity QED with atomic qubits where the atoms interact with a highly detuned cavity mode with the assistance of a classical field. The scheme is insensitive to the cavity decay and the thermal field. Based on cavity QED techniques, the scheme can be realizable.
暂无评论