Results 21 to 30 of about 108,083 (217)

Quantum Gates to Other Universes [PDF]

Fortschritte der Physik, 2018
AbstractWe present a microscopic model of a bridge connecting two large Anti‐de‐Sitter Universes. The Universes admit a holographic description as three‐dimensional supersymmetric gauge theories based on large linear quivers, and the bridge is a small rank‐n gauge group that acts as a messenger.
Bachas, Constantin,, Lavdas, Ioannis
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Algebras and universal quantum computations with higher dimensional systems [PDF]

, 2002
Here is discussed application of the Weyl pair to construction of universal set of quantum gates for high-dimensional quantum system. An application of Lie algebras (Hamiltonians) for construction of universal gates is revisited first.
Vlasov, Alexander Yu.
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Efficient Decomposition of Quantum Gates [PDF]

Physical Review Letters, 2004
Optimal implementation of quantum gates is crucial for designing a quantum computer. We consider the matrix representation of an arbitrary multiqubit gate. By ordering the basis vectors using the Gray code, we construct the quantum circuit which is optimal in the sense of fully controlled single-qubit gates and yet is equivalent with the multiqubit ...
Juha J. Vartiainen, Martti M. Salomaa, Mikko Möttönen   +2 more
openaire   +4 more sources

Universal quantum circuit for n-qubit quantum gate: a programmable quantum gate

Quantum Information and Computation, 2007
Quantum computation has attracted much attention, among other things, due to its potentialities to solve classical NP problems in polynomial time. For this reason, there has been a growing interest to build a quantum computer. One of the basic steps is to implement the quantum circuit able to realize a given unitary operation. This task has been solved
Rubens Viana Ramos, P. B. M. Sousa
openaire   +3 more sources

Universal quantum gates based on a pair of orthogonal cyclic states: Application to NMR systems [PDF]

, 2003
We propose an experimentally feasible scheme to achieve quantum computation based on a pair of orthogonal cyclic states. In this scheme, quantum gates can be implemented based on the total phase accumulated in cyclic evolutions.
A. Shnirman, A.M. Steane, A.M. Steane, C.H. Bennett, D. Deutsch, D.P. DiVincenzo, D.V. Averin, G. Falci, G. Ni, I.I. Rabi, J. Preskill, J.A. Jones, J.A. Jones, J.I. Cirac, L.M. Duan, L.M. Duan, L.M. Duan, M.V. Berry, N.A. Gershenfeld, P. Zanardi, P. Zanardi, P.W. Shor, Q.A. Turchette, Q.G. Lin, Q.G. Lin, S. Lloyd, S.L. Zhu, S.L. Zhu, S.L. Zhu, S.L. Zhu, S.L. Zhu, Shi-Liang Zhu, T. Pellizzari, X.B. Wang, X.B. Wang, X.B. Wang, X.B. Wang, Y. Aharonov, Y. Makhlin, Y. Makhlin, Y. Nakamura, Y. Nakamura, Z. D. Wang   +42 more
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Quantum Gates and Decoherence

, 2006
In the lectures we will be concerned with some aspects of physical implementations of quantum gate operations which are necessary for quantum information processing. We will discuss two possible realizations. One of them is based on qubits being encoded in atomic degrees of freedom where the atoms are manipulated in optical lattices above atom chips ...
E. A. Hinds, Jiannis K. Pachos, Stefan Scheel, Peter L. Knight   +3 more
openaire   +3 more sources

Optimal two-qubit quantum circuits using exchange interactions

, 2005
The Heisenberg exchange interaction is a natural method to implement non-local (i.e., multi-qubit) quantum gates in quantum information processing. We consider quantum circuits comprising of $(SWAP)^\alpha $ gates, which are realized through the exchange
Fan, Heng, Roychowdhury, Vwani, Szkopek, Thomas   +2 more
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Efficient Quantum Computation with Probabilistic Quantum Gates [PDF]

Physical Review Letters, 2005
With a combination of the quantum repeater and the cluster state approaches, we show that efficient quantum computation can be constructed even if all the entangling quantum gates only succeed with an arbitrarily small probability $p$. The required computational overhead scales efficiently both with $1/p$ and $n$, where $n$ is the number of qubits in ...
Duan, L.-M., Kimble, H. J.
openaire   +6 more sources

Multibit Gates for Quantum Computing [PDF]

Physical Review Letters, 2001
We present a general technique to implement products of many qubit operators communicating via a joint harmonic oscillator degree of freedom in a quantum computer. By conditional displacements and rotations we can implement Hamiltonians which are trigonometric functions of qubit operators.
Wang, Xiaoguang, Sørensen, Anders, Mølmer, Klaus   +2 more
openaire   +5 more sources

Quantum Computer with Mixed States and Four-Valued Logic

, 2003
In this paper we discuss a model of quantum computer in which a state is an operator of density matrix and gates are general quantum operations, not necessarily unitary.
Abragam A, Aharonov D, Alicki R, Barenco A, Barut A O, Bechmann-Pasquinucci H, Blum K, Bowden C M, Brylinski J L, Cerf N, Cerf N J, Crawford J A, Dennison K A, Deutsch D, Eckart C, Emch G, Fick E, Gantmaher F R, Gardiner C W, Hellwing K E, Hellwing K H, King C, Kraus K, Kraus K, Lanzos C, Lindblad G, Lloyd S, Lukasiewicz J, Orihara A, Palma G M, Post E L, Rescher N, Rosser J B, Rungta P, Ruskai M B, Schmutz M, Schwerdtfeger H, Schwinger J, Shor P W, Shor P W, Shor P W, Stean A M, Suzuki M, Tarasov V E, Tarasov V E, Tarasov V E, Tarasov V E, Terhal B M, Vasily E Tarasov, Vilenkin N Ya, Vilenkin N Ya, Yablonskii S V, Yablonskii S V   +52 more
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