Zobrazeno 1 - 10
of 87
pro vyhledávání: '"Magesan, Easwar"'
We develop a time-dependent Schrieffer-Wolff-Lindblad perturbation theory to study effective interactions for driven open quantum systems. The starting point of our analysis is a given Lindblad equation, based on which we obtain an effective (average
Externí odkaz:
http://arxiv.org/abs/2206.12467
Autor:
Malekakhlagh, Moein, Magesan, Easwar
Off-resonant error for a driven quantum system refers to interactions due to the input drives having non-zero spectral overlap with unwanted system transitions. For the cross-resonance gate, this includes leakage as well as off-diagonal computational
Externí odkaz:
http://arxiv.org/abs/2108.03223
Autor:
Hertzberg, Jared B., Zhang, Eric J., Rosenblatt, Sami, Magesan, Easwar, Smolin, John A., Yau, Jeng-Bang, Adiga, Vivekananda P., Sandberg, Martin, Brink, Markus, Chow, Jerry M., Orcutt, Jason S.
Publikováno v:
npj Quantum Information 7, 129 (2021)
As superconducting quantum circuits scale to larger sizes, the problem of frequency crowding proves a formidable task. Here we present a solution for this problem in fixed-frequency qubit architectures. By systematically adjusting qubit frequencies p
Externí odkaz:
http://arxiv.org/abs/2009.00781
Autor:
Sundaresan, Neereja, Lauer, Isaac, Pritchett, Emily, Magesan, Easwar, Jurcevic, Petar, Gambetta, Jay M.
Publikováno v:
PRX Quantum 1, 020318 (2020)
We present an improvement to the cross resonance gate realized with the addition of resonant, target rotary pulses. These pulses, applied directly to the target qubit, are simultaneous to and in phase with the echoed cross resonance pulses. Using spe
Externí odkaz:
http://arxiv.org/abs/2007.02925
Publikováno v:
Phys. Rev. A 102, 042605 (2020)
We present a comprehensive theoretical study of the cross-resonance gate operation covering estimates for gate parameters and gate error as well as analyzing spectator qubits and multi-qubit frequency collisions. We start by revisiting the derivation
Externí odkaz:
http://arxiv.org/abs/2005.00133
Autor:
Magesan, Easwar, Gambetta, Jay M.
Publikováno v:
Phys. Rev. A 101, 052308 (2020)
Effective Hamiltonian methods are utilized to model the two-qubit cross-resonance gate for both the ideal two-qubit case and when higher levels are included. Analytic expressions are obtained in the qubit case and the higher-level model is solved bot
Externí odkaz:
http://arxiv.org/abs/1804.04073
Autor:
Takita, Maika, Córcoles, A. D., Magesan, Easwar, Abdo, Baleegh, Brink, Markus, Cross, Andrew, Chow, Jerry M., Gambetta, Jay M.
Publikováno v:
Phys. Rev. Lett. 117, 210505 (2016)
We present parity measurements on a five-qubit lattice with connectivity amenable to the surface code quantum error correction architecture. Using all-microwave controls of superconducting qubits coupled via resonators, we encode the parities of four
Externí odkaz:
http://arxiv.org/abs/1605.01351
Autor:
McKay, David C., Filipp, Stefan, Mezzacapo, Antonio, Magesan, Easwar, Chow, Jerry M., Gambetta, Jay M.
Publikováno v:
Phys. Rev. Applied 6, 064007 (2016)
A challenge for constructing large circuits of superconducting qubits is to balance addressability, coherence and coupling strength. High coherence can be attained by building circuits from fixed-frequency qubits, however, leading techniques cannot c
Externí odkaz:
http://arxiv.org/abs/1604.03076
Publikováno v:
Phys. Rev. A 93, 060302 (2016)
We present improvements in both theoretical understanding and experimental implementation of the cross resonance (CR) gate that have led to shorter two-qubit gate times and interleaved randomized benchmarking fidelities exceeding 99%. The CR gate is
Externí odkaz:
http://arxiv.org/abs/1603.04821
Publikováno v:
npj Quantum Information 2,16012 (2016)
Randomized benchmarking is a widely used experimental technique to characterize the average error of quantum operations. Benchmarking procedures that scale to enable characterization of $n$-qubit circuits rely on efficient procedures for manipulating
Externí odkaz:
http://arxiv.org/abs/1510.02720