Questions tagged [solid-state]
For questions regarding design, development or theory of solid-state devices as relevant to quantum computers. May also be used for questions regarding solid state physics or chemistry, if they are relevant to quantum computing.
17
questions
2
votes
1
answer
434
views
Fermionic commutation relation using Jordan-Wigner transformation
How can one show in detailed steps that Fermionic annihilation and creation operators, under Jordan-Wigner transformation, satisfy the Fermionic commutation relations?
The Fermionic commutation ...
- 525
4
votes
3
answers
113
views
Why does joint ground state not change under action of beam splitting unitary operator?
How can one show that $\hat{U}|00\rangle=|00\rangle$ where $\hat{U}=e^{-igt(\hat{a}^\dagger_2\hat{a}_1+\hat{a}^\dagger_1\hat{a}_2)}$ and $|00\rangle$ is the unique joint zero eigenstate of the ...
- 525
8
votes
3
answers
433
views
If a Hamiltonian is quadratic in the ladder operator, why is its time evolution linear in the ladder operator?
How can one show that $\hat{U}^\dagger\hat{a}\hat{U}$ (with $\hat{U} =e^{-i\hat{H}t}$) involves only linear orders of the ladder operator, when $H$ is the general quadratic Hamiltonian $(\hat{H} = \...
- 525
4
votes
2
answers
415
views
Fermionic occupation operator and nearest neighbor Fermionic hopping interaction as a qubit operator
How to express Fermionic occupation operator $(\hat{a}_j^\dagger\hat{a}_j)$ and nearest neighbor Fermionic hopping interaction ($H_h= J\sum_{i=1}\hat{a}_i^\dagger \hat{a}_{i+1}+\hat{a}_{i+1}^\dagger \...
- 525
4
votes
0
answers
101
views
Is there a measurable of entanglement for a many-body system?
After having a discussion with a quantum computing colleague, a question came up: is there any meaningful way to measure entanglement (or something related to it) in a solid-state many body system ...
- 508
5
votes
1
answer
95
views
Do we know anything about the computational complexity of the exchange-correlation functional?
Density functional theory is based on the Hohenberg-Kohn (HK) theorems and aims to compute the ground-state many-body wavefunction of a physical material and/or molecules.
To put it simply, the HK ...
- 508
7
votes
1
answer
663
views
Difference between coherence transfer, polarization transfer and population transfer?
I asked a question on Physics Stack Exchange but no one answered the question and I didn't get enough views on it. I am asking it on QCSE because the question is related to experimental quantum ...
- 255
16
votes
2
answers
6k
views
What's the Difference between T2 and T2*?
$T_2$ generally refers to the measurement of the coherence of the qubit with respect to its dephasing (that's a rotation through the $|0\rangle$ - $|1\rangle$ axis of the Bloch sphere for those of us ...
- 1,340
4
votes
1
answer
81
views
Do avoided crossings / CTs /ZEFOZs optimize quantum fidelity in practice?
CTs / ZEFOZs: Energy level structures that include avoided crossings at accessible energies tend to be resilient to noise and therefore present high coherence times, at least in the case of spin ...
- 3,777
7
votes
1
answer
127
views
Translation of color/toric code to a small network of solid-state spins
Within Quantum Error Correction and stabilizer codes, toric codes/surface codes are very tempting, mainly for their high error threshold. For more background please check up, in our Physics sister (...
- 3,777
5
votes
1
answer
150
views
Which temperature has been the highest to achieve a quantum logic operation?
My question is somehow related with a previous one: What is the most optimistic perspective of room-temperature solid-state QC?.
Regarding solid-state qubits,
What is the highest temperature at ...
- 673
12
votes
0
answers
122
views
Active improving of nanodiamond surfaces for NV centers?
This question is related (and complementary) to "Passive improving of nanodiamond surfaces for NV centers?".
Nitrogen-Vacancy centers (NVs) have astonishing quantum properties, which make them ...
- 3,777
5
votes
1
answer
134
views
Passive improving of nanodiamond surfaces for NV centers?
Nitrogen-Vacancy centers (NVs) have astonishing quantum properties, which make them interesting as potential hardware both for quantum computing in particular and for quantum technologies in general. ...
- 3,777
5
votes
1
answer
129
views
What is the most optimistic perspective of room-temperature solid-state QC?
I've read the "trend" article entitled Is a room-temperature, solid-state quantum computer mere fantasy? from almost 10 years ago, and was wondering if things have really changed: What is the current ...
- 885
9
votes
1
answer
254
views
Decoherence of spin-entangled triplet-pair states in the solid state: local vs delocalized vibrations
The context: We are in the solid state. After a photon absortion by a system with a singlet ground state, the system undergoes the spin-conserving fission of one spin singlet exciton into two spin ...
- 3,777
10
votes
0
answers
193
views
Entanglement transfer of spin-entangled triplet-pair states between flying qubits and stationary qubits
The context: We are in the solid state. After a photon absortion by a system with a singlet ground state, the system undergoes the spin-conserving fission of one spin singlet exciton into two spin ...
- 3,777
21
votes
3
answers
2k
views
Is Quantum Biocomputing ahead of us?
Now that we know of bio/molecular tools that allow living organisms to deal with quantum computations e.g. the fancy proteins that allow birds to handle quantum coherence (e.g. The quantum needle of ...
- 381