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)
Questions tagged [trapped-ion]
18 questions
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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 is a Raman transition: the ion absorbs an…
Sam Jaques
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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.94.014506
Considering the gate operation…
user111
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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 that in a single trap, the qubits have all-to-all…
Sam Jaques
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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 chain like in the figure below (source):
This is basically…
faysay
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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 TI hardware (single-qubit rotations and 2-qubit MS…
Edifice
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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 quantum computer and be optimized to take full…
user10151
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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 of the Schrodinger's equation in this scenario.…
Tech Solver
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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?
Callum
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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 qubits have longer lifetimes (thinking in terms of…
grav.field
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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 Schrodinger's equation?
With no applied field and…
Anna Naden
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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)}\left(\frac{\pi}{2}\right),\quad…
Oilobobolus
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Unexpected behavior of trapped ion's motional mode (phonon) heating simulation
I'm a novice at qutip simulation.
I was recently trying to use qutip to simulate the heating effect of a trapped ion by defining a jump operator defined with heating rate.
Below is the code of my simulation:
from qutip import *
from qutip_utils…
Kyungmin Kim
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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 other devices. For me, this seems like hardware…
vollautomatthi
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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 remarkable success can be attributed to its impressive…
Max
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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 were positively charged, a negative charge at the…
user2521987
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