18 What cryogenic systems are suitable for superconducting qubits? 2018-03-12T19:53:58.863

18 What is the difference between transmon and Xmon qubits? 2018-03-31T16:20:43.957

17 What is the difference between a qubit and classical bit? 2018-03-14T19:59:21.727

17 What is a qubit? 2018-06-18T15:14:18.037

16 What does it mean for two qubits to be entangled? 2018-04-07T10:41:55.107

15 Is Google's 72 qubit device better than D-Wave's machines, which feature more than 2000 qubits? 2018-03-28T23:25:26.580

13 How to store qubits while preserving Heisenberg's uncertainty principle? 2018-04-01T12:27:24.017

13 What is the longest time a qubit has survived with 0.9999 fidelity? 2018-04-12T19:23:47.013

13 Why do the IBM and Google processors both have 53 qubits? 2019-10-23T14:03:14.947

11 State produced by spontaneous parametric down-conversion (SPDC) 2018-03-13T00:50:59.097

11 What is the physical representation of a qubit? 2018-03-28T14:50:42.507

10 What is the difference between a qubit and a quantum state? 2018-04-23T14:33:21.520

10 Resources for quantum algorithm basics 2018-06-07T18:45:24.193

9 What does it mean for a quantum computer to have $X$ qubits? 2018-08-17T17:26:47.417

9 How can one imagine entanglement in a non-mathematical way? 2021-01-14T00:19:00.727

8 How do you apply a CNOT on polarization qubits? 2018-04-17T08:15:49.980

8 The process for transferring qubits between locations 2018-07-26T16:25:26.450

8 What limits scaling down the size of superconducting qubits? 2018-11-07T08:00:10.157

7 How to make qubits more stable towards noise? 2018-03-13T06:40:05.623

7 Does Barkhausen noise affect the measurement of magnetic particle based qubits? 2018-03-26T02:22:40.907

7 Are there measuring standards (and units) for the identification of qubits? 2018-04-23T14:22:21.420

7 What's the difference between a set of qubits and a capacitor with a subdivided plate? 2018-06-04T01:53:47.593

7 What are the pros/cons of Trapped Ion Qubits, Superconducting Qubits and Si Spin Qubits? 2018-07-26T16:12:40.003

7 Difference between coherence transfer, polarization transfer and population transfer? 2018-09-02T17:37:41.353

7 How to interpret $-\rvert1\rangle \otimes \rvert1\rangle = -\rvert11\rangle$? 2019-05-30T09:33:54.660

6 What is the relation between single photon qubits and squeezed light qubits? 2018-04-15T09:37:38.783

6 Are qubits preferred over qumode, and if so, why? 2018-07-22T09:24:26.393

6 Transmons and cooper pair box qubits: two islands or a single island and a reservoir 2018-08-29T15:25:25.843

6 How do we physically initialize qubits in a Quantum register? 2018-09-17T18:00:54.897

6 Is there any single-logical-qubit physical device out there as of end 2018? 2018-11-08T07:47:52.543

6 Physical qubit of optical quantum computer 2019-05-28T18:27:47.837

5 How is a single qubit fundamentally different from a classical coin spinning in the air? 2018-06-24T10:55:31.113

5 What is continuous quantum register and how it relates to qubits? 2018-08-21T14:43:47.137

5 Non-layperson explanation of why a qubit is more useful than a bit? 2018-12-05T16:57:36.890

5 Interaction of an RF pulse with transmon qubit 2019-02-15T21:59:24.633

5 How do physical implementations of Z gate selectively affect $\lvert1\rangle $ basis vector? 2019-05-30T04:41:32.467

5 What design considerations set the frequency bounds for superconducting qubits? 2019-08-07T04:42:09.120

5 What are the physical reasons behind noise/errors in quantum computers? 2019-09-06T01:11:03.800

5 Is there anything practical that can be done with a single qubit? 2020-01-20T13:56:47.070

5 What are some good resources for learning about photonic qubits? 2020-03-22T15:36:42.433

5 Qubit Connectivity of IBM Quantum Computer 2020-12-08T07:47:51.290

5 How instantaneous is state preparation in a quantum register, if all possible superpositions are to be initialized equally? 2020-12-20T10:54:56.817

4 Processing density capabilities in a quantum processor 2018-04-01T04:26:16.580

4 Do avoided crossings / CTs /ZEFOZs optimize quantum fidelity in practice? 2018-05-12T17:34:38.400

4 What is the significance of recent demonstration of a passive photonâ€“atom qubit swap operation? 2018-09-04T10:46:37.297

4 What is the charging energy in relation to a superconducting transmon? 2019-04-03T00:20:57.390

4 How is a physical qubit measured and how is the result interpreted? 2019-05-18T13:36:52.010

4 Why are superconducting qubits the most popular approach to build a quantum computer? 2019-11-28T06:24:57.467

4 What exactly does it mean to embed classical data into a quantum state? 2020-03-30T15:27:56.990

4 What's the default value for a quantum register? 2021-02-08T06:49:42.720

3 Are qubits the only elements required to build a quantum computer? 2018-09-11T10:07:24.300

3 Polarization and qubit information 2018-11-13T03:26:03.243

3 Rabi oscillations with different energy differences 2019-02-05T21:21:06.077

3 Can one make NV centred type qubits from analogus materials in the periodic table? 2019-02-18T10:43:03.727

3 What does an observable in a different basis mean physically? 2019-03-03T17:22:29.240

3 What "states" can a qubit have if it doesn't have values? 2019-06-02T23:37:11.550

3 How much power do quantum computers use based on the number of qubits being allocated? 2019-06-05T16:28:13.617

3 States of a qubit in a DC-SQUID 2019-06-22T02:45:00.907

3 Excitation of a superconducting circuit 2019-08-06T21:02:38.143

3 What is the difference between a cooper pair box and a transmon qubit? 2019-08-23T16:41:49.427

3 What does a gate electrode do in the context of a quantum dot? 2021-01-27T18:21:10.380

2 Hamiltonian of the valence electron of Yb+ ion 2019-02-05T21:03:03.873

2 What noise channel that is not coming from the control can lead to XY qubit rotations? 2019-03-08T21:26:01.143

2 How many physical qubits are used when I run a program on a IBM Q computer? 2019-04-01T03:24:58.080

2 Physical realization of qubits with superconducting Josephson junctions 2019-06-20T06:13:22.737

2 I thought we had already passed this error and qubit threshold? 2019-07-01T21:49:17.660

2 Measuring a quantum wire at t > 0 2019-07-10T19:05:47.563

2 Why don't qubits continuously rotate in the $z$ direction due to free time evolution? 2019-08-24T11:13:52.163

2 What is the difference between superposition of $|0\rangle$ and superposition of $|1\rangle$ at physical level? 2019-11-09T14:32:25.717

2 What is the problem in demonstrating quantum supremacy? 2019-11-14T15:01:29.747

2 Question about DIY Quantum Computer Prototype 2020-06-28T22:34:29.270

2 What determines the topology/connectedness of quantum computers? 2020-08-19T21:00:28.243

2 What are some resources on qubits based on quantum dots? 2020-10-02T18:02:21.457

2 How significant is achieving electronic transport in a single qubit at room temperature? 2021-02-22T03:26:20.607

2 What is the difference between SWAP & Bridge gates? 2021-02-24T02:45:38.417

1 Converting a qubit's state to a binary value in Q# 2019-06-04T19:49:01.697

1 Charge Qubit vs Transmon 2019-07-08T17:31:01.403

1 Atom magnetic moment caused by orbiting electron 2019-11-15T15:48:38.707

1 How do I explain qubits to my cousin who is 8 year old? 2020-02-26T14:47:47.453

1 How to deal with the relative phase from the evaluation of the not interacting qubit? 2020-02-28T11:03:39.883

1 Readout using an NMR spectrum 2020-03-20T21:37:52.747

1 How qubit phase is build in real hardware? 2020-04-08T01:04:32.850

1 How promising is the possibility of carbon-based qubits to make a qubit thatâ€™s stable at room temperature? 2020-06-02T16:39:21.367

1 Can we have multiple-state unit for quantum computer? 2020-06-27T03:19:25.120

1 How do you CNOT between qubits faraway from each other? 2020-08-07T02:12:07.913

1 Why do we use two optical modes per qubit in the KLM scheme? 2020-08-19T20:33:47.850

1 In $|x_1,...,x_n\rangle$, can the individual constituents be called qubits? 2020-08-27T02:30:50.317

1 How do quantum gates work on qubits in the physical world? 2020-08-31T16:52:51.623

1 What is the meaning of measuring a Bell state with Pauli operators? 2020-11-23T21:56:18.200

0 Can entangled qubits be disentangled without using code or software? 2019-06-04T21:03:42.207

0 Calculating the state of the qubit when $\alpha$ and $\beta$ are given 2020-05-11T05:19:46.023

0 What are some general concepts of how a classical computer would interface with a quantum computer? 2020-07-02T19:37:59.100

-1 Can a classical limit of qubit emerge on a classical computer? 2019-12-19T15:28:39.147

-2 Is quantum superposition state a truth or an assumption? 2019-11-30T17:47:07.353

-3 Building a DIY quantum computer - how to reduce a noise? 2020-01-12T14:24:15.480