魔力资源可以提高道的量子容量
Kaifeng Bu1,2, Arthur Jaffe2,3
1The Ohio State University, Department of Mathematics, Columbus, Ohio 43210, USA.
Physical review letters
|February 21, 2025
概括
魔力资源增强了量子通信能力. 将魔力状态引入离散光束分离器通道增加了它的量子容量,与产生零容量的稳定器状态不同.
科学领域:
- 量子信息科学 量子信息科学
- 量子通信道 量子通信道
- 量子通道容量 量子通道容量
背景情况:
- 一个通道的量子容量量化了它传输量子信息的能力.
- 稳定器状态和魔力状态是量子信息处理中的关键资源.
- 离散光束分割器是最近提出的量子通道模型,具有固定的环境状态.
研究的目的:
- 为了研究魔法资源对离散光束分离器通道量子容量的影响.
- 为了确定量子容量为零或非零的条件.
- 量化魔法状态和量子容量之间的关系.
主要方法:
- 分析带有固定环境状态的离散光束分割器量子通道.
- 基于环境状态的性质 (稳定剂与魔术) 的量子容量的数学推导.
- 量化魔法状态和通道容量之间的线性关系.
主要成果:
- 当环境状态是稳定器状态时,量子容量为零.
- 对于某些魔法状态,量子容量是非零的.
- 量子容量随着环境中单个量子的魔力状态的数量呈现线性增加.
- 在魔法资源方面,最大量子容量的边界被确立.
结论:
- 魔力资源可以显著增加通信道的量子容量.
- 稳定器状态将量子容量限制在零,而魔力状态将其增强.
- 这项研究为稳定器和魔力状态在量子通信中的不同作用提供了新的见解.
相关概念视频
Maximum Power Transfer
216
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
By substituting the entire circuit with...
216
Quantum Numbers
34.2K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
34.2K
Buffers: Buffer Capacity
1.2K
Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH.
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak...
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak...
1.2K
The Maximum Power Transfer Theorem
526
Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
526
Design Example: Capacitance Multiplier Circuit
673
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
673
Characteristics of Series Resonant Circuit
216
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
216


