GianCarlo Ghirardi, Raffaele Romano
In a recent paper, Kalamidas has advanced a new proposal of faster than light communication which has not yet been proved invalid. In this paper, by strictly sticking to the standard quantum formalism we prove that, as all previous proposals, it does not work.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
继续探索
In a recent paper, Kalamidas has advanced a new proposal of faster than light communication which has not yet been proved invalid. In this paper we show that, as all previous proposals, it does not work. The mistake arises from an inappropriate use of some approximations.
We analyze critically a recent proposal of faster than light communication.
On a recent proposal of faster than light quantum communication
在最近的一篇论文中，A.Y. Shiekh讨论了一种实验装置，在他看来，这种装置应该可以利用量子波函数的坍缩实现超光速通信。与过去提出的许多建议相反，他没有采用两个系统的纠缠态，而是用一个粒子在两个状态的叠加中工作-对应于它在相反方向上的传播-其中一个通过适当的干涉仪。干涉仪附近的观察者可以自由选择是否沿其中一条路径引入移相器，这就可以瞬间改变在对应于另一种叠加态的远处区域找到粒子的概率，并相应地改变到达远处观察者的粒子束的强度。在本文中，我们指出一个缺陷的论点：再次，因为它已被证明在充分的一般性很久以前，波包减少的过程不能用于超光速通信。
Reply to `On a recent proposal of faster than light quantum communication'
在最近的一篇论文中，作者提出了通过量子波函数的坍缩进行超光速通信的实验的可能性。Bassi和Ghirardi对此进行了分析，并认为这种分析本身值得详细审查。
We propose a way for implementing quantum information transfer with two superconducting flux qubits, by coupling them to a resonator. This proposal does not require adjustment of the level spacings or uniformity in the device parameters. Moreover, neither adiabatic passage nor a second-order detuning is needed by this proposal, thus the operation can be performed much faster when compared with the previous proposals.
We present a way to realize quantum information transfer with superconducting flux qubits coupled to a cavity. Because only resonant qubit-cavity interaction and resonant qubit-pulse interaction are applied, the information transfer can be performed much faster, when compared with the previous proposals. This proposal does not require adjustment of the qubit level spacings during the operation. Moreover, neither uniformity in the device parameters nor exact placement of qubits in the cavity is needed by this proposal.
We propose a way for realizing a two-qubit controlled phase gate with superconducting quantum interference devices (SQUIDs) coupled to a superconducting resonator. In this proposal, the two lowest levels of each SQUID serve as the logical states and two intermediate levels of each SQUID are used for the gate realization. We show that neither adjustment of SQUID level spacings during the gate operation nor uniformity in SQUID parameters is required by this proposal. In addition, this proposal does not require the adiabatic passage or a second-order detuning and thus the gate is much faster.
Faster Quantum Algorithm for Multiple Observables Estimation in Fermionic Problems
本文提出一种通用自适应QGE算法框架及其两种变体，实现费米系统集体性质估计的高效计算，相比现有算法在有限粒子数系统中提供二次加速。
A Proposal of Testing Imaginary Time in a Total Reflection
在最近的实验中报道的所有关于超光速信号传播的悖论都可以通过在量子框架中使用虚时间来消除。本文提出了一种在全反射中检验虚时的方法。
The paper is a Chapter of a book. In it an exhaustive review of the proposals to send faster than light signals resorting to quantum nonlocality and the reduction process is presented, together with a critical analysis and rebuttal of all proposals. The most interesting part of the Chapter is the one in which the problem of quantum cloning is discussed. Actually, a proposal of superluminal signaling based on an hypothetical cloning machine has been presented by N. Herbert. The proposal does not work just because of the assumption that one can clone nonorthogonal states. The fact that such a ma…
Quantum Speedups for Multiproposal MCMC
提出QPMCMC2算法，利用量子计算实现多提案MCMC的高效加速，适用于大规模图模型和细菌进化网络的贝叶斯推断。
We present a way for fast implementation of a two-qubit controlled phase gate with superconducting flux qubits coupled to a cavity. A distinct feature of this proposal is that since only qubit-cavity resonant interaction and qubit-pulse resonant interaction are used, the gate can be performed much faster when compared with the previous proposals. This proposal does not require adjustment of the qubit level spacings during the gate operation. In addition, neither uniformity in the qubit parameters nor exact placement of qubits in the cavity is needed by this proposal.
We propose to couple an on-chip high finesse superconducting cavity to the lateral-motion and spin state of a single electron trapped on the surface of superfluid helium. We estimate the motional coherence times to exceed 15 microseconds, while energy will be coherently exchanged with the cavity photons in less than 10 nanoseconds for charge states and faster than 1 microsecond for spin states, making the system attractive for quantum information processing and cavity quantum electrodynamics experiments. Strong interaction with cavity photons will provide the means for both nondestructive read…
Relativistic cryptography is a proposal for achieving unconditional security that exploits the fact that no information carrier can travel faster than the speed of light. It is based on space-time constraints but doesn't require quantum hardware. Nevertheless, it was unclear whether this proposal is realistic or not. Recently, Alikhani et al. [ABC+21] performed an implementation of a relativistic zero-knowledge for NP. Their implemented scheme shows the feasibility of relativistic cryptography but it is only secure against classical adversaries. In this work, we present a new relativistic prot…
Quantum buses and quantum computer architecture based on quantum dots
我们提出了一种基于量子点的量子计算机架构，用于短距离和长距离通信/计算。我们的方案利用自组装量子点的自然特性，它是可扩展的。它的核心思想是基于半导体自组装量子点的量子总线。这允许在不同的量子寄存器之间传输量子位，并且可以集成在用于基于半导体量子点的量子计算的大多数当前提议中。我们的建议利用{ \it相对较短}自旋链的特殊性质，并详细讨论了两种可能的实现方式的优点和缺点，这两种实现方式都是基于自旋链全局动力学。该方案的一个明显优点是避免了使用微腔进行量子计算机不同元件之间的长距离通信。在这方面，我们的计划是比较快的混合量子点-微腔计划。
扫码添加微信好友，提出您的宝贵建议 👇
💡 备注请填写：网站反馈
发表机构由 AI 从论文文本抽取，如发现错误，欢迎反馈修正建议。