Switching via quantum activation: A parametrically modulated oscillator 兲
... fluctuations become more and more important, and below a certain crossover temperature switching occurs via tunneling 关1–3兴. The behavior of systems away from thermal equilibrium is far more complicated. Still, for classical systems switching is often described by an activation type law, with the te ...
... fluctuations become more and more important, and below a certain crossover temperature switching occurs via tunneling 关1–3兴. The behavior of systems away from thermal equilibrium is far more complicated. Still, for classical systems switching is often described by an activation type law, with the te ...
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... is ln ∆E/L1/2 . Indeed, as seen in Figure 1, the accumulated probability distribution function ...
... is ln ∆E/L1/2 . Indeed, as seen in Figure 1, the accumulated probability distribution function ...
Towards a Quantum Programming Language
... The recent literature contains several proposals for quantum programming languages. One of the first contributions in this direction is an article by Knill (1996). While not proposing an actual programming language, Knill outlines a set of basic principles for writing pseudo-code for quantum algorit ...
... The recent literature contains several proposals for quantum programming languages. One of the first contributions in this direction is an article by Knill (1996). While not proposing an actual programming language, Knill outlines a set of basic principles for writing pseudo-code for quantum algorit ...
Interpretation Neutrality in the Classical Domain of Quantum Theory
... with some particular interpretation of quantum mechanics) for this decoherencecompatible collapse is left unspecified. This analysis counters the notion promulgated by some authors that recovering classical behavior from quantum theory is a highly interpretation-dependent affair. For example, many ...
... with some particular interpretation of quantum mechanics) for this decoherencecompatible collapse is left unspecified. This analysis counters the notion promulgated by some authors that recovering classical behavior from quantum theory is a highly interpretation-dependent affair. For example, many ...
Producing Squeezed Input States for an Atomic Clock Using an Optical Cavity.
... The projection noise of uncorrelated test particles imposes a limit on measurement precision known as the Standard Quantum Limit, relevant to current time and frequency measurements [1]. The use of quantum mechanical entanglement to overcome this limit is an active area of research. In the context o ...
... The projection noise of uncorrelated test particles imposes a limit on measurement precision known as the Standard Quantum Limit, relevant to current time and frequency measurements [1]. The use of quantum mechanical entanglement to overcome this limit is an active area of research. In the context o ...
UNCERTAINTY PRINCIPLE AND QUANTUM FISHER INFORMATION
... The purpose of this paper is to put the above inequality in a more geometric form by means of quantum Fisher information (namely the monotone metrics classified by Petz). ...
... The purpose of this paper is to put the above inequality in a more geometric form by means of quantum Fisher information (namely the monotone metrics classified by Petz). ...
Some trends in the philosophy of physics - Philsci
... always found in only one place at a time. The measurement problem, then, is to explain how to get from the ‘many positions’ implied by the quantum formalism to the one position observed. The measurement problem has been an important motivation for a number of different interpretations of quantum mec ...
... always found in only one place at a time. The measurement problem, then, is to explain how to get from the ‘many positions’ implied by the quantum formalism to the one position observed. The measurement problem has been an important motivation for a number of different interpretations of quantum mec ...
Toward Practical Solid-State Based Quantum Memories
... KLM scheme [1], and quantum repeaters [2, 3] are prominent candidates for practical photonic quantum computation and long-distance quantum communication. Quantum memories for photons are key elements for any practical implementation of these schemes. Practical quantum memories require theoretical an ...
... KLM scheme [1], and quantum repeaters [2, 3] are prominent candidates for practical photonic quantum computation and long-distance quantum communication. Quantum memories for photons are key elements for any practical implementation of these schemes. Practical quantum memories require theoretical an ...
Chapter 1
... more information can be contained in a qubit than in a bit. While a bit has only one bit of information, 0 or 1, the qubit can be represented by a point on a sphere (this sphere is called a Bloch Sphere [Nielsen00]). So, theoretically qubit has an infinite capacity. However, the information in the q ...
... more information can be contained in a qubit than in a bit. While a bit has only one bit of information, 0 or 1, the qubit can be represented by a point on a sphere (this sphere is called a Bloch Sphere [Nielsen00]). So, theoretically qubit has an infinite capacity. However, the information in the q ...
Quantum key distribution
Quantum key distribution (QKD) uses quantum mechanics to guarantee secure communication. It enables two parties to produce a shared random secret key known only to them, which can then be used to encrypt and decrypt messages. It is often incorrectly called quantum cryptography, as it is the most well known example of the group of quantum cryptographic tasks.An important and unique property of quantum key distribution is the ability of the two communicating users to detect the presence of any third party trying to gain knowledge of the key. This results from a fundamental aspect of quantum mechanics: the process of measuring a quantum system in general disturbs the system. A third party trying to eavesdrop on the key must in some way measure it, thus introducing detectable anomalies. By using quantum superpositions or quantum entanglement and transmitting information in quantum states, a communication system can be implemented which detects eavesdropping. If the level of eavesdropping is below a certain threshold, a key can be produced that is guaranteed to be secure (i.e. the eavesdropper has no information about it), otherwise no secure key is possible and communication is aborted.The security of encryption that uses quantum key distribution relies on the foundations of quantum mechanics, in contrast to traditional public key cryptography which relies on the computational difficulty of certain mathematical functions, and cannot provide any indication of eavesdropping at any point in the communication process, or any mathematical proof as to the actual complexity of reversing the one-way functions used. QKD has provable security based on information theory, and forward secrecy.Quantum key distribution is only used to produce and distribute a key, not to transmit any message data. This key can then be used with any chosen encryption algorithm to encrypt (and decrypt) a message, which can then be transmitted over a standard communication channel. The algorithm most commonly associated with QKD is the one-time pad, as it is provably secure when used with a secret, random key. In real world situations, it is often also used with encryption using symmetric key algorithms like the Advanced Encryption Standard algorithm. In the case of QKD this comparison is based on the assumption of perfect single-photon sources and detectors, that cannot be easily implemented.