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Questions tagged [trapped-ion]

A trapped ion quantum computer is one proposed approach to a large-scale quantum computer. Ions, or charged atomic particles, can be confined and suspended in free space using electromagnetic fields. (Wikipedia)

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Cirac-Zoller CNOT gate implemented by Schmidt-Kaler

I am deriving the Cirac-Zoller CNOT gate as implemented by Schmidt-Kaler following the text of Nakahara & Ohmi's textbook Quantum Computing: From Liner Algebra to Physical Realizations. The gate ...
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Does the Steane code have characteristics which make it especially useful for trapped-ion devices?

On the web page of the Error Correction Zoo for the [[7,1,3]] Steane Code, there are quite a few realizations on trapped-ion devices. In fact, there are a lot of implementations generally compared to ...
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How do I compile a circuit to the native gateset of Quantinuum's trapped-ion devices?

Suppose I have a quantum circuit defined in pytket, qiskit or some other quantum SDK. How do I compile my circuit to be in the native gateset of the Quantinuum trapped ion device/emulators?
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What is the optimal hardware for quantum computing, and what factors contribute to its preference?

In conventional computing, the use of CMOS (Complementary Metal Oxide Semiconductor) technology as the foundational circuitry for digital logic gates in CPUs has become the industry norm. CMOS's ...
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How to perform the $2\pi$ pulse in the two-ion Cirac-Zoller CNOT gate?

When implementing the Cirac-Zoller CNOT gate between two ions $A$ and $B$, the second step of the procedure changes the sign of the second ion when the ion is in its ground state $|0_B\rangle$ and the ...
grav.field's user avatar
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Is there any reason to use optical qubits instead of hyperfine qubits?

In trapped ion quantum computing, while optical qubits have an energy difference of hundreds of THz, hyperfine qubits operate in the microwave regime ($1\sim 10$ THz). Due to this reason, hyperfine ...
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What are currently the best reported qubit error rates per gate operation?

Based on some investigation, I have found the best qubit coherence timescales, in superconducting architectures, to be the order of milliseconds. https://journals.aps.org/prb/abstract/10.1103/PhysRevB....
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Could a “disco ball” be a good geometry for trapped ion quantum computers?

It seems to me that a good geometry for an ion trap quantum computer would be to constrain the ions to lie on the surface of a sphere. Their mutual repulsion would space them out evenly. If the ions ...
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High-weight errors from ion trap crosstalk

A basic assumption of various error correction threshold theorems is that the probability of an error exponentially decreases with the weight of the error. One of the selling features of ion traps is ...
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Simultaneous computational basis measurement

Many quantum algorithms requires measurements at the end of the processing and it seems like the quantum state measurement setup is required to be made for measuring the two computational basis. I ...
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Measurement in the Pauli X basis

A qubit in the state $|1\rangle + |0\rangle$, normalized, is time-dependent, right? So it sweeps around the equator of the Bloch sphere at a frequency proportional to the energy gap according to ...
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Raman scattering goes in all directions, so why doesn't it decohere trapped ions?

I'm trying to learn about the physics of ion traps, and my understanding is that an ion can be moved from a ground state to an excited state by stimulation with a laser pulse. More specifically, this ...
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Are there differences in how quantum error correcting codes are applied on superconducting vs. trapped ion systems?

Are there any differences in how quantum error correcting codes are currently applied on superconducting vs. trapped ion systems?
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Expanding two rotation operators

I have the following operators acting on two qubits, denoted as $(1)$ and $(2)$: $$T_1=\displaystyle\exp\left(-i\frac{\pi}{4}Z\otimes Z\right)\cdot R_z^{(1)}\left(\frac{\pi}{2}\right)\cdot R_z^{(2)}\...
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Gate SWAP vs Physical SWAP in Trapped Ions for chain reordering

In trapped ion quantum computers, especially in systems with multiple traps, you may need at some point to perform a "chain reordering", in which you change an ion's position within the ion ...
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What are the available compilers for Trapped-Ion Quantum Computing Architecture?

I am looking for a compiler to compile a high-level quantum circuit for the Trapped-Ion Quantum Computing architecture, i.e. a compiler that can translate a high-level circuit to native gates of the ...
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What are the mathematical prerequisites to study machine learning on quantum computers?

Besides machine learning, quantum info theory, optimization, and statistics knowledge, what are the prerequisites to implement existing ML techniques and create new ML techniques that would work on a ...
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Ion trap qubit Hamiltonian calculation manipulation

What is the Hamiltonian of a single ion in an ion trap? How to derive that formula? Also, how exactly can we create superposition by sending laser beams? I am interested in knowing the exact solutions ...
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