Quantum Channel Capacities , [1905.01286] Computing Quantum Channel Capacities
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Determining the capacities of quantum channels is one of the fundamental problems of quantum information theory. This problem is extremely challenging and technically Recently there s distance has been considerable activity on the subject of the additivity of various quantum channel capacities. Here, we construct a family of channels with a sharply bounded classical
Quantum channels, essential for information transfer, exhibit a fundamental trade-off between signalling capacity and the preservation of athermality—a measure of deviation from thermal ite program if V is a set of channels characterized by semidefinite conditions. Applications in quantum channel capacities We utilize the geometric R ́enyi divergence to study several
[1905.01286] Computing Quantum Channel Capacities
Capacity as a metric for quantum transducers We use the concept of quantum capacities of bosonic channels to assess the performance of direct quantum transducers. The Abstract—A quantum communication channel can be put to many uses: it can transmit classical information, private classical information, or quantum information. It can be used alone, with
Capacities of quantum channels are fundamental quantities in the theory of quantum information. A desirable property is the additivity for a capacity. However, this cannot
Researchers demonstrate an exact analytical formula for quantifying the information capacity of decohering quantum channels, applicable to systems of any finite dimension and There are two different quantum capacities of major concern, the (unassisted) quantum capacity Q and the two-way assisted quantum capacity Q↔ , depending on whether classical Interesting results on the quantum capacity of dephasing channels with memory can be obtained for forgetful channels, for which the memory dies out exponentially with time.
Mark M. Wilde The quantum capacity theorem is one of the most important theorems in quantum Shannon theory. It is a fundamentally \quantum“ theorem in that it demonstrates that channel can be put to a Quantum superdense coding provides a compelling solution to enhance the channel capacity compared with classical coding, which plays a vital role in quantum networks.
We determine both the quantum and the private capacities of low-noise quantum channels to lead-ing orders in the channel’s distance to the perfect channel. It has been an The quantum channels is capacity of noisy quantum channels characterizes the highest rate at which information can be reliably transmitted and it is therefore of practical as well as fundamental
Tema con variazioni: quantum channel capacity Dennis Kretschmann1 and Reinhard F Werner1 Published 23 February 2004 • Published under licence by IOP Publishing
We study the quality of service in quantum channels. We regard the quantum channel as a queueing system, and present queueing analysis of both the classical information World Scientific Publishing Co Pte Ltd Quantum channel capacity is a fundamental quantity in order to understand how well quantum information can be transmitted or corrected when subjected to noise. However, it
Then the quantum channel capacity χ is defined through the Holevo–Schumacher–Westmoreland (HSW) theorem. Such a theorem can conceptually be 466 Quantum channel capacities fundamental building It is also convenient to refer to an approximation of a given channel by another. In this chapter, such an approximation is always assumed to be de ned
The quantum channel-state duality permits the characterization of a quantum process through a quantum state, referred to as a Choi state. This characteristic serves as the We show the equivalence of two different notions of quantum channel capacity: that which uses the entanglement fidelity as its criterion of success in transmission, and that Unlike a classical communication channel, a quantum channel is characterised by a whole set of different capacities, which depend on the type of transmitted information (classical or quantum)
Capacities of quantum channels are fundamental quantities in the theory of quantum information. A desirable property is the additivity for a capacity. However, this cannot Quantum communication channels and quantum memories are the fundamental building blocks of large-scale quantum communication networks. Estimating their capacity to Estimating the capacity of quantum channels is relevant to understand at which rate quantum information can be exchanged. Here, the authors introduce multi-level amplitude
Asymptotic regularization is generically necessary making the study of capacities notoriously hard. In this work, by a proper refinement of the physical settings of quantum communication using An upper limit is given to the amount of quantum information that can be transmitted reliably down a noisy, decoherent quantum channel using the high-probability We work out a theory of approximate quantum error correction that allows us to derive a general lower bound for the entanglement fidelity of a quantum code. The lower bound
We establish several remarkable properties for this Rényi divergence that are particularly useful in quantum information theory and show how they can be used to provide
We consider the transmission of classical information over a quantum channel. The channel is defined by an „alphabet“ of quantum states, e.g., certain photon polarizations,
An expression is derived characterizing the set of admissible rate pairs for simultaneous transmission of classical and quantum information over a given quantum Quantum information processing exploits the quantum nature of information. It offers fundamentally new solutions in the field of computer science and extends the As applications, we explore various channel capacity problems and construct new channel information measures based on the geometric Rényi divergence, sharpening the