Suppressing Weak Ising Couplings: Tailored Gates for Quantum Computation
نویسنده
چکیده
I describe the use of techniques based on composite rotations to develop controlled phase gates in which the effects of weak Ising couplings are suppressed. A tailored composite phase gate is described which both suppresses weak couplings and is relatively insensitive to systematic errors in the size of strong couplings.
منابع مشابه
Finkelstein state computation with kinematical gates − Quantum ground
state computation with kinematical gates − Quantum ground Email alerting service here corner of the article or click Receive free email alerts when new articles cite this article-sign up in the box at the top right-hand We develop a computation model for solving Boolean networks that implements wires dynamically through quantum ground-state computation and implements gates kine-matically throug...
متن کاملEnergetic Suppression of Decoherence in Exchange-Only Quantum Computation
Universal quantum computation requiring only the Heisenberg exchange interaction and suppressing decoherence via an energy gap is presented. The combination of an always-on exchange interaction between the three physical qubits comprising the encoded qubit and a global magnetic field generates an energy gap between the subspace of interest and all other states. This energy gap suppresses decohe...
متن کاملTwo-qubit quantum gates construction via unitary factorization
Quantum information and quantum computation are emerging research areas based on the properties of quantum resources, such as superposition and entanglement. In the quantum gate array version, the use of convenient and proper gates is essential. While these gates adopt theoretically convenient forms to reproduce computational algorithms, their design and feasibility depend on specific quantum s...
متن کاملQuantum computation with untunable couplings.
Most quantum computer realizations require the ability to apply local fields and tune the couplings between qubits, in order to realize single bit and two bit gates which are necessary for universal quantum computation. We present a scheme to remove the necessity of switching the couplings between qubits for two bit gates, which are more costly in many cases. Our strategy is to compute with enc...
متن کاملThe Quantum Gate Design Metric
What is the time-optimal way of realizing quantum operations? Here, we show how important instances of this problem can be related to the study of shortest paths on the surface of a sphere under a special metric. Specifically, we provide an efficient synthesis of a controlled NOT (CNOT) gate between qubits (spins 1 2 ) coupled indirectly via Ising-type couplings to a third spin. Our implementat...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003