Optimized Reversible Vedic Multipliers for High Speed Low Power
... computation is independent of clock frequency of the processor. Hence one can limit the clock frequency to a lower value. Also, since processors using lower clock frequency dissipate lower energy, it is economical in terms of power factor to use low frequency processors employing fast algorithms lik ...
... computation is independent of clock frequency of the processor. Hence one can limit the clock frequency to a lower value. Also, since processors using lower clock frequency dissipate lower energy, it is economical in terms of power factor to use low frequency processors employing fast algorithms lik ...
A parallel repetition theorem for entangled projection
... that each apply to their respective question in order to determine their answer, and this interpretation leads to the classical value VAL of the game. In contrast, in quantum theory isolated players are allowed any set of strategies that can be implemented by performing local measurements on a share ...
... that each apply to their respective question in order to determine their answer, and this interpretation leads to the classical value VAL of the game. In contrast, in quantum theory isolated players are allowed any set of strategies that can be implemented by performing local measurements on a share ...
Lecture 7: Shor`s Factorisation Algorithm Introduction The Factoring
... • Start with two qubit registers of size n (large enough to hold some number N ) • Prepare these registers both in state |0i. • The composite system then has state |ψi = |0i |0i • First we apply the QFT to the first register. Recall that the QFT is ...
... • Start with two qubit registers of size n (large enough to hold some number N ) • Prepare these registers both in state |0i. • The composite system then has state |ψi = |0i |0i • First we apply the QFT to the first register. Recall that the QFT is ...
Probabilistic quantum metrology Bernat Gendra Casalí
... figure of merit allows her to order the different protocols in terms of her needs, taking into account what use will be given to the estimated value. Up until now most quantum metrology schemes and known bounds have been deterministic, that is, they are optimized in order to provide a valid estimate ...
... figure of merit allows her to order the different protocols in terms of her needs, taking into account what use will be given to the estimated value. Up until now most quantum metrology schemes and known bounds have been deterministic, that is, they are optimized in order to provide a valid estimate ...
Disorder and entropy rate in discrete time quantum walks
... kind. In fact, most quantum processes can be viewed as generalized quantum walks. Here, we have to note that classical walks can be generalized to quantum walks in several ways. These definitions are all competing and complementing each other, however, most of them share a common point: They satisfy ...
... kind. In fact, most quantum processes can be viewed as generalized quantum walks. Here, we have to note that classical walks can be generalized to quantum walks in several ways. These definitions are all competing and complementing each other, however, most of them share a common point: They satisfy ...
Quantum dynamics in strong fluctuating fields - Physik Uni
... Different approaches have been developed over the years within this general line of reasoning. Within a variety of different approaches, the method of path-integrals in real time [1, 2, 19–21] and the projection operator method [22–31] provide some of the most frequently used methods. The path-integra ...
... Different approaches have been developed over the years within this general line of reasoning. Within a variety of different approaches, the method of path-integrals in real time [1, 2, 19–21] and the projection operator method [22–31] provide some of the most frequently used methods. The path-integra ...
Models of wave-function collapse
... we call a physical system a quantum system and when do we call it a classical measuring apparatus? In other words, where is the quantum-classical divide? How much mass or how many degrees of freedom (say number of nucleons) should an object have, before it qualifies as an apparatus? Of course, in or ...
... we call a physical system a quantum system and when do we call it a classical measuring apparatus? In other words, where is the quantum-classical divide? How much mass or how many degrees of freedom (say number of nucleons) should an object have, before it qualifies as an apparatus? Of course, in or ...
and fourth-order temporal interference
... two-photon state produced by spontaneous parametric downconversion (SPDC) appear to confirm the rule-of-thumb: when the temporal delay is scanned, high-visibility two-photon interference (the HOM dip) is observed and V 12 = 1, while the singles rate remains flat at V1 = 0 [6]. It has recently been s ...
... two-photon state produced by spontaneous parametric downconversion (SPDC) appear to confirm the rule-of-thumb: when the temporal delay is scanned, high-visibility two-photon interference (the HOM dip) is observed and V 12 = 1, while the singles rate remains flat at V1 = 0 [6]. It has recently been s ...
Ph410 Physics of Quantum Computation1
... on quantum processes which are intrinsically reversible (except for measurement; see prob. 5). A second important distinction between classical and quantum computation (i.e., physics), besides the irreversibility of quantum measurement, is that an arbitrary (unknown) quantum state cannot be copied e ...
... on quantum processes which are intrinsically reversible (except for measurement; see prob. 5). A second important distinction between classical and quantum computation (i.e., physics), besides the irreversibility of quantum measurement, is that an arbitrary (unknown) quantum state cannot be copied e ...
Statistical Mechanics to Disordered Quantum Optimization
... Thus, in Chapter 2, we review the classical complexity theory necessary to understand the important statement that P 6= NP and its more recent quantum generalization BQP 6= QMA. These complexity theoretic conjectures essentially assert that there exist natural classes of problems (called NP-complet ...
... Thus, in Chapter 2, we review the classical complexity theory necessary to understand the important statement that P 6= NP and its more recent quantum generalization BQP 6= QMA. These complexity theoretic conjectures essentially assert that there exist natural classes of problems (called NP-complet ...
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.