Entanglement purification with two-way classical communication
نویسندگان
چکیده
Quantum information theory and quantum computation study the use of quantum physics in information processing and computation[1]. Many important results such as quantum teleportation, superdense coding, factoring and search algorithms make use of quantum entanglements as fundamental resources [2, 3, 4, 5]. Therefore, entanglement purification protocols, the procedures by which we extract pure-state entanglements from mixed states, merit our study.
منابع مشابه
Proof of security of quantum key distribution with two-way classical communications
Shor and Preskill have provided a simple proof of security of the standard quantum key distribution scheme by Bennett and Brassard (BB84) by demonstrating a connection between key distribution and entanglement purification protocols with one-way communications. Here we provide proofs of security of standard quantum key distribution schemes, BB84 and the six-state scheme, against the most genera...
متن کاملTwo-way quantum communication channels
We consider communication between two parties using a bipartite quantum operation, which constitutes the most general quantum mechanical model of two-party communication. We primarily focus on the simultaneous forward and backward communication of classical messages. For the case in which the two parties share unlimited prior entanglement, we give inner and outer bounds on the achievable rate r...
متن کاملMixed-state entanglement and quantum error correction.
Entanglement purification protocols (EPP) and quantum errorcorrecting codes (QECC) provide two ways of protecting quantum states from interaction with the environment. In an EPP, perfectly entangled pure states are extracted, with some yield D, from a bipartite mixed state M ; with a QECC, an arbitrary quantum state |ξ〉 can be transmitted at some rate Q through a noisy channel χ without degrada...
متن کاملSecurity of quantum key distribution protocol with two-way classical communication assisted by one-time pad encryption
In this paper, we consider a quantum key distribution protocol (QKD) with twoway classical communication that is assisted by one-time pad encryption. We propose a two-way preprocessing that uses one-time pad encryption by previously shared secret key, and the net key rate of the QKD with proposed preprocessing exceeds the key rate of the QKD without it. The preprocessing is reduced to the entan...
متن کاملSymmetric extendibility for a class of qudit states
The concept of symmetric extendibility has recently drawn attention in the context of tolerable error rates in quantum cryptography, where it can be used to decide whether quantum states shared between two parties can be purified by means of entanglement purification with one-way classical communication only. Unfortunately, at present there exists no simple general criterion to decide whether a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Quantum Information & Computation
دوره 8 شماره
صفحات -
تاریخ انتشار 2008