Results 61 to 70 of about 2,092,913 (379)

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

Shadow estimation of gate-set properties from random sequences

Nature Communications, 2023
With quantum computing devices increasing in scale and complexity, there is a growing need for tools that obtain precise diagnostic information about quantum operations.
J. Helsen, M. Ioannou, J. Kitzinger, E. Onorati, A. H. Werner, J. Eisert, I. Roth   +6 more
doaj   +1 more source

Gate errors in solid state quantum computer architectures

, 2002
We theoretically consider possible errors in solid state quantum computation due to the interplay of the complex solid state environment and gate imperfections.
A. Shnirman, A. Steane, B.E. Kane, B.E. Kane, C. Monroe, C. Rangan, C.H. Bennett, D. Loss, D. Mozyrsky, D.G. Cory, D.P. DiVincenzo, D.V. Averin, I.P. Christov, J.I. Cirac, M.-S. Choi, N.A. Gershenfeld, R. Fazio, R. Vrijen, S. Das Sarma, V. Privman, X. Hu, X. Hu, Xuedong Hu, Y. Makhlin, Y. Nakamura   +24 more
core   +1 more source

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

Elementary gates for quantum computation [PDF]

Physical Review A, 1995
We show that a set of gates that consists of all one-bit quantum gates (U(2)) and the two-bit exclusive-or gate (that maps Boolean values $(x,y)$ to $(x,x \oplus y)$) is universal in the sense that all unitary operations on arbitrarily many bits $n$ (U($2^n$)) can be expressed as compositions of these gates. We investigate the number of the above gates
David P. DiVincenzo, Adriano Barenco, Norman Margolus, Tycho Sleator, Richard Cleve, Peter W. Shor, Charles H. Bennett, John A. Smolin, Harald Weinfurter   +8 more
openaire   +4 more sources

Two-qubit entangling gates for superconducting quantum computers

Results in Physics
Noisy intermediate-scale quantum computers (NISQ) have demonstrated superior performance compared to conventional computing schemes. Nonetheless, errors associated with two-qubit entangling gates remain a substantial obstacle in fully harnessing the ...
Muhammad AbuGhanem, Hichem Eleuch
doaj   +1 more source

Circuit connectivity boosts by quantum-classical-quantum interfaces

Physical Review Research, 2022
High-connectivity circuits are a major roadblock for current quantum hardware. We propose a hybrid classical-quantum algorithm to simulate such circuits without swap-gate ladders.
Roeland Wiersema, Leonardo Guerini, Juan Felipe Carrasquilla, Leandro Aolita   +3 more
doaj   +1 more source

Multiqubit quantum phase gate using four-level superconducting quantum interference devices coupled to superconducting resonator

, 2012
In this paper, we propose a scheme to realize three-qubit quantum phase gate of one qubit simultaneously controlling two target qubits using four-level superconducting quantum interference devices (SQUIDs) coupled to a superconducting resonator.
Irfan, Muhammad, Qamar, Shahid, Waseem, Muhammad   +2 more
core   +1 more source

Process tomography of ion trap quantum gates [PDF]

, 2006
A crucial building block for quantum information processing with trapped ions is a controlled-NOT quantum gate. In this paper, two different sequences of laser pulses implementing such a gate operation are analyzed using quantum process tomography ...
C. F. Roos, D. J. Wineland, H. Häffner, K. Kim, M. Riebe, P. O. Schmidt, P. Schindler, R. Blatt, T. K. Körber, T. Monz, W. Hänsel   +10 more
core   +2 more sources

Optimal Multi-Bit Toffoli Gate Synthesis

IEEE Access, 2023
Multi-bit Toffoli gates form an essential quantum gate class for quantum algorithms. They should be efficiently decomposed into elementary single- or multi-qubit quantum gates, such as CNOT, T, and Hadarmard, for a scalable implementation of a quantum ...
Young-Min Jun, In-Chan Choi
doaj   +1 more source