Circuit QED: Superconducting Qubits Coupled to
... enough to be visible to the naked eye, these artificial atoms have a very simple discrete set of quantized energy levels which are nearly as well understood as those of the prototypical single-electron atom, hydrogen. Furthermore it has proven possible to put these atoms into coherent superpositions ...
... enough to be visible to the naked eye, these artificial atoms have a very simple discrete set of quantized energy levels which are nearly as well understood as those of the prototypical single-electron atom, hydrogen. Furthermore it has proven possible to put these atoms into coherent superpositions ...
Coqa: a Concurrent Programming Model with Ubiquitous Atomicity
... application is usually composed of few tasks, each with a very limited number of quanta. – If two Java threads each have 100 steps of execution, there are C200100 interleaving scenarios. – If the two threads are modeled by Coqa tasks, each formed by 3 quanta, there are only C63 = 20 scenarios. ...
... application is usually composed of few tasks, each with a very limited number of quanta. – If two Java threads each have 100 steps of execution, there are C200100 interleaving scenarios. – If the two threads are modeled by Coqa tasks, each formed by 3 quanta, there are only C63 = 20 scenarios. ...
Chance in the Everett Interpretation
... Where in all this are the physical probabilities? For physicalists, they can only be grounded on the actual structure of events—what Lewis has called a ‘Humean tapestry’ of events (Lewis [1986], Introduction, Sec.1), whereupon the same identificatory project ensues as in EQM.² The links (i), (ii), ( ...
... Where in all this are the physical probabilities? For physicalists, they can only be grounded on the actual structure of events—what Lewis has called a ‘Humean tapestry’ of events (Lewis [1986], Introduction, Sec.1), whereupon the same identificatory project ensues as in EQM.² The links (i), (ii), ( ...
Polaronic exciton in a parabolic quantum dot
... binding energies calculated using this potential are compared with those obtained using statically screened Coulomb potential and are found to be considerably larger for all values of the quantum dot size. In small quantum dots, the electron – hole correlation is reduced as the single particle energ ...
... binding energies calculated using this potential are compared with those obtained using statically screened Coulomb potential and are found to be considerably larger for all values of the quantum dot size. In small quantum dots, the electron – hole correlation is reduced as the single particle energ ...
Coherent and incoherent evolution of qubits in
... much as possible; •Control coupling of qubits without presence of nearby electrodes and associated electromagnetic fluctuations; ...
... much as possible; •Control coupling of qubits without presence of nearby electrodes and associated electromagnetic fluctuations; ...
Single photons from single ions: quantum interference and distant ion interaction Dissertation
... values simultaneously with one quantum circuit. Including quantum interference in the computation, quantum parallelism allows for the evaluation of a function to be balanced or constant in exponentially reduced time than a classical deterministic computer [7, 10]. Besides the single- and multi-qubit ...
... values simultaneously with one quantum circuit. Including quantum interference in the computation, quantum parallelism allows for the evaluation of a function to be balanced or constant in exponentially reduced time than a classical deterministic computer [7, 10]. Besides the single- and multi-qubit ...
On Classical and Quantum Objectivity - Philsci
... with the generators of the symmetry transformations required for the objective reduction of the state. In classical mechanics, this correspondence is provided by the map f 7→ vf between classical observables f ∈ C ∞ (M ) and Hamiltonian vector fields vf ∈ HM . In particular, the momentum p defines t ...
... with the generators of the symmetry transformations required for the objective reduction of the state. In classical mechanics, this correspondence is provided by the map f 7→ vf between classical observables f ∈ C ∞ (M ) and Hamiltonian vector fields vf ∈ HM . In particular, the momentum p defines t ...
Implementing Qubits with Superconducting Integrated Circuits Michel H. Devoret and John M. Martinis
... sections we will describe how the tunneling of Cooper pairs creates an inductive path with strong non-linearity, thus creating energy levels suitable for a qubit. The tunnel barrier is typically fabricated from oxidation of the superconducting metal. This results in a reliable barrier since the oxid ...
... sections we will describe how the tunneling of Cooper pairs creates an inductive path with strong non-linearity, thus creating energy levels suitable for a qubit. The tunnel barrier is typically fabricated from oxidation of the superconducting metal. This results in a reliable barrier since the oxid ...
Hybrid opto-mechanical systems with nitrogen
... degree of freedom. To increase the coherence time of mechanical oscillator, we can optimize the design and choose the materials with high mechanical Q, such as Si3 N4 with Q around 106 [39]. However, the best way is optically trapping the nanodiamond in vacuum [22, 40–48]. The mechanical Q factor in ...
... degree of freedom. To increase the coherence time of mechanical oscillator, we can optimize the design and choose the materials with high mechanical Q, such as Si3 N4 with Q around 106 [39]. However, the best way is optically trapping the nanodiamond in vacuum [22, 40–48]. The mechanical Q factor in ...
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.