Adiabatic Quantum Computation is Equivalent to Standard Quantum Computation Dorit Aharonov
... the transformation is carried out sufficiently slowly, the system tracks the ground state of the time varying Hamiltonian and therefore ends up in the desired ground state of Hfinal . Indeed, if the spectral gap of the time varying Hamiltonian is never too small then the entire process can be carrie ...
... the transformation is carried out sufficiently slowly, the system tracks the ground state of the time varying Hamiltonian and therefore ends up in the desired ground state of Hfinal . Indeed, if the spectral gap of the time varying Hamiltonian is never too small then the entire process can be carrie ...
Completely positive post-Markovian master equation via a
... with the operator in square brackets serving as the generator of the evolution. Experimental determination of the kernel function. Suppose one measures 共t兲 via quantum state tomography 共QST兲 关3兴. It follows from Eq. 共10兲 applied to 共t兲 that i共t兲 = Tr关Li共t兲兴 / Tr关Li共0兲兴. The coefficients i共t兲 a ...
... with the operator in square brackets serving as the generator of the evolution. Experimental determination of the kernel function. Suppose one measures 共t兲 via quantum state tomography 共QST兲 关3兴. It follows from Eq. 共10兲 applied to 共t兲 that i共t兲 = Tr关Li共t兲兴 / Tr关Li共0兲兴. The coefficients i共t兲 a ...
Many-Body effects in Semiconductor Nanostructures Stockholm University Licentiat Thesis
... Low dimensional semiconductor structures are key building blocks in modern electronic technology, being the basis of several applications such as solar cells, light-emitting diodes and transistors. Quantum mechanical effects are of special importance in semiconductor structures and a proper understa ...
... Low dimensional semiconductor structures are key building blocks in modern electronic technology, being the basis of several applications such as solar cells, light-emitting diodes and transistors. Quantum mechanical effects are of special importance in semiconductor structures and a proper understa ...
Highly doubly excited S states of the helium atom
... Lanczos algorithm (Delande er a1 1991). In this way we get a number of candidates with one program call. The eigenvalues are checked for convergence by systematically increasing the basis size. Note that at this stage the parameter p is not optimized but remains the same for all eigenvalues calculat ...
... Lanczos algorithm (Delande er a1 1991). In this way we get a number of candidates with one program call. The eigenvalues are checked for convergence by systematically increasing the basis size. Note that at this stage the parameter p is not optimized but remains the same for all eigenvalues calculat ...
Power point
... – Much of network traffic contents predictable – Easier when three or more packets collide ...
... – Much of network traffic contents predictable – Easier when three or more packets collide ...
Phys. Rev. Lett. 108, 100501 - APS Link Manager
... limit of a classical crystal, Eint d2 =L for d aR , where d is the distance between the qubits and the ends of the quantum bus. Owing to quantum fluctuations, the classical crystal cannot be the true ground state, and the system is rather described in terms of a Luttinger liquid [27,28]. However ...
... limit of a classical crystal, Eint d2 =L for d aR , where d is the distance between the qubits and the ends of the quantum bus. Owing to quantum fluctuations, the classical crystal cannot be the true ground state, and the system is rather described in terms of a Luttinger liquid [27,28]. However ...
Quantum computing with rare-earth-ion doped crystals
... carried out before the qubit decoheres and looses its quantum properties. 3. The qubits must interact such that they can become entangled For a two-qubit gate there is often a control bit which determines whether an operation on a target qubit takes place or not. An excited ion can shift nearby ions ...
... carried out before the qubit decoheres and looses its quantum properties. 3. The qubits must interact such that they can become entangled For a two-qubit gate there is often a control bit which determines whether an operation on a target qubit takes place or not. An excited ion can shift nearby ions ...
Quantum-Secure Message Authentication Codes
... adversaries capable of classical chosen message queries, but is insecure when the adversary can issue quantum chosen message queries. We then present a number of quantum secure MAC systems. Quantum secure MACs. In the classical settings many MAC systems are based on the observation that a secure pse ...
... adversaries capable of classical chosen message queries, but is insecure when the adversary can issue quantum chosen message queries. We then present a number of quantum secure MAC systems. Quantum secure MACs. In the classical settings many MAC systems are based on the observation that a secure pse ...
Ultrafast geometric control of a single qubit using chirped pulses
... of the qubit transitions in a quantum register should be small enough to allow many quantum operations [6, 19], we restrict our consideration by choosing the two lowest levels in the three-level system as the qubit states. External addressing of the qubit is done by using the Raman excitation scheme ...
... of the qubit transitions in a quantum register should be small enough to allow many quantum operations [6, 19], we restrict our consideration by choosing the two lowest levels in the three-level system as the qubit states. External addressing of the qubit is done by using the Raman excitation scheme ...
Document
... state. Z is said to have a maximal belief structure. Subjective Bayesian answer We trust quantum over classical coin tossing because an agent who believes the coin is fair cannot rule out an insider attack, whereas the beliefs that lead to a pure-state assignment are inconsistent with any other part ...
... state. Z is said to have a maximal belief structure. Subjective Bayesian answer We trust quantum over classical coin tossing because an agent who believes the coin is fair cannot rule out an insider attack, whereas the beliefs that lead to a pure-state assignment are inconsistent with any other part ...
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.