Toward a scalable, silicon-based quantum computing architecture
... tems can be composed from multiple qubits, for example, . An -qubit state is described by or 1The speed of this channel is, however, limited by the rate at which two classical bits can be transmitted from source to destination, without which the quantum information is ambiguous. ...
... tems can be composed from multiple qubits, for example, . An -qubit state is described by or 1The speed of this channel is, however, limited by the rate at which two classical bits can be transmitted from source to destination, without which the quantum information is ambiguous. ...
Phase Distribution of the Output of Jaynes
... The squeezed displaced Fock states (SDFS’s) have been introduced and studied in [1]. These states generalize squeezed coherent states, squeezed number states, and displaced Fock states [2]. They exhibit both number squeezing in the strong sense and the quadrature squeezing. One of the most fundament ...
... The squeezed displaced Fock states (SDFS’s) have been introduced and studied in [1]. These states generalize squeezed coherent states, squeezed number states, and displaced Fock states [2]. They exhibit both number squeezing in the strong sense and the quadrature squeezing. One of the most fundament ...
Infinite-randomness quantum critical points induced by dissipation
... A second potential application is provided by the pair breaking superconductor-metal quantum phase transitions in nanowires.30 It can be described by a one-dimensional O共2兲 LGW theory with Ohmic dissipation.31–33 There is an experimental evidence that the pair breaking in this systems is caused by s ...
... A second potential application is provided by the pair breaking superconductor-metal quantum phase transitions in nanowires.30 It can be described by a one-dimensional O共2兲 LGW theory with Ohmic dissipation.31–33 There is an experimental evidence that the pair breaking in this systems is caused by s ...
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... Furthermore, the magnitude of the induced current depends on f ex, indicating that input states with different coefficients a and b are prepared. Finally, we apply both pulse 1 and pulse 2 with an interval of 85 ps (orange curves in Fig. 2). In this case, I C shows the same dependence as that when o ...
... Furthermore, the magnitude of the induced current depends on f ex, indicating that input states with different coefficients a and b are prepared. Finally, we apply both pulse 1 and pulse 2 with an interval of 85 ps (orange curves in Fig. 2). In this case, I C shows the same dependence as that when o ...
Quantum monodromy in the two-centre problem Waalkens
... The two-centre problem represents an important integrable limiting case of the three-body problem. As such it has a long history dating back to Euler and Jacobi, see [1, 2] and the reference therein. The corresponding quantum system plays a similar fundamental role in molecular physics as the hydrog ...
... The two-centre problem represents an important integrable limiting case of the three-body problem. As such it has a long history dating back to Euler and Jacobi, see [1, 2] and the reference therein. The corresponding quantum system plays a similar fundamental role in molecular physics as the hydrog ...
Exact solutions of effective
... operator is still an open problem. In the light of all these, the present work addresses a more general and compact framework introducing two different models to solve exactly for a physical system involving a position dependent mass with the consideration of all physically acceptable Hamiltonians p ...
... operator is still an open problem. In the light of all these, the present work addresses a more general and compact framework introducing two different models to solve exactly for a physical system involving a position dependent mass with the consideration of all physically acceptable Hamiltonians p ...
hosted here - Jeffrey C. Morton
... a categorification of a set-based structure is to make one recognizable by the fact that the original structure appears when we “decategorify” it. A special type of categorification is called “groupoidification” [2], since a groupoid is a special type of category. It again amounts to reversing a pro ...
... a categorification of a set-based structure is to make one recognizable by the fact that the original structure appears when we “decategorify” it. A special type of categorification is called “groupoidification” [2], since a groupoid is a special type of category. It again amounts to reversing a pro ...
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.