QCEngine Intro

QCEngine Hands-On Introduction

This is an active QC simulator, which provides a programming interface, as well as a programmer's visual model, for QC operations. It's not finished yet, but you're welcome to browse. Please give feedback to qc@machinelevel.com!

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Welcome!

This page provides a live demo to accompany the Quantum Image Supersampling talk.


	qc_options.color_by_phase = true; qc_options.circle_scale = 0.5; qc.reset(4); var qx = qint.new(2, 'qx'); var qy = qint.new(2, 'qy'); qx.write(0); qy.write(0); // Just an example scene evaluation function apply_shader() { qc.phase(180, 1\|4); qc.phase(180, 2\|8); qc.not(2\|8); qc.phase(180, 2\|4\|8); qc.not(2\|8); } qc.hadamard(); apply_shader(); - apply_shader(); - qy.write(1); - monte carlo equiv - qx.hadamard(); - qy.hadamard(); - qc.Grover(); - qc.read();	Ready.

2. Counter
	qc_options.color_by_phase = true; qc_options.circle_scale = 0.5; var qxy_bits = 4; var counter_bits = 3; qc.reset(qxy_bits + counter_bits); var qxy = qint.new(qxy_bits, 'qxy'); var counter = qint.new(counter_bits, 'counter'); qxy.write(0); qxy.hadamard(); counter.write(0); // Just an example scene evaluation function apply_shader2(target, condition) { target.phase(180, 1\|4, condition); target.phase(180, 2\|8, condition); target.not(2\|8); target.phase(180, 2\|4\|8, condition); target.not(2\|8); } function do_iterations(target, counter, shader_func) { var eval_count = 0; for (var bit = 0; bit < counter.numBits; ++bit) { for (var iter = 0; iter < (1 << bit); ++iter) { shader_func(target, counter.bits(1 << bit)); // if (bit == 0) qxy.Grover(counter.bits(1 << bit)); // else // qxy.Grover(); } } } qc.write(0); qc.hadamard(); do_iterations(qxy, counter, apply_shader2); - shader+Grover; - counter = 0; - counter = 1; - counter = 2; - counter = 3; - counter = superposition; - counter.invQFT(); - counter.read();	Ready.

3. Waveguides
	qc_options.color_by_phase = true; qc_options.circle_scale = 0.5; function main() { do_qss(4, 3, shader3); } function do_qss(qxy_bits, counter_bits, shader_func) { qc.reset(qxy_bits + counter_bits); var qxy = qint.new(qxy_bits, 'qxy'); var counter = qint.new(counter_bits, 'counter'); qc.codeLabel(''); qxy.write(0); qxy.hadamard(); counter.write(0); counter.hadamard(); do_iterations(qxy, counter, shader_func); qc.codeLabel('iQFT'); counter.invQFT(); qc.codeLabel(''); counter.read(); } function shader3(target, condition) { target.phase(180, 1\|4, condition); target.phase(180, 2\|8, condition); target.not(2\|8); target.phase(180, 2\|4\|8, condition); target.not(2\|8); } main(); - convert to beamsplitters - fix adjacency - parallelize - construct IPKISS	Ready.

	qc_options.color_by_phase = true; panel_staff.setVisible(true); panel_chart.setVisible(true); qc_options.circle_scale = 0.5; qc.enableAnimation(); qc.enableRecording(); //var version = 'simplest'; var version = 'pre-entangled'; var convert_to_beamsplitters = false; var swap_to_adjacent = false; if (version == 'pre-entangled') { qc.reset(4); var unused = qint.new(1, '(unused)'); var qx = qint.new(1, 'qx'); var counter = qint.new(1, 'counter'); var c2 = qint.new(1, 'c2'); var flip_one = 1; // programmable shader vals var flip_both = 0; // programmable shader vals qc.codeLabel(''); // qx.write(0); qc.codeLabel('pair source'); c2.pair_source(counter); qx.pair_source(unused); unused.discard(); // qc.hadamard(2); // qc.cnot(4, 2); qc.start_photon_sim(); qc.codeLabel('init'); // qc.hadamard(1); qc.codeLabel('eval'); qx.phase(180flip_one, ~0, c2.bits(1)); counter.phase(180flip_both, ~0); qc.codeLabel('Grover'); qx.Grover(counter.bits(1)); qc.codeLabel('invQFT'); counter.invQFT(); c2.invQFT(); qc.stop_photon_sim(); qc.codeLabel(''); c2.read(); // counter.read(); } if (version == 'simplest') { qc.reset(2); var qx = qint.new(1, 'qx'); var counter = qint.new(1, 'counter'); var flip_one = 0; // programmable shader vals var flip_both = 0; // programmable shader vals qc.codeLabel('init'); qc.write(0, 1\|2); qc.hadamard(1\|2); qc.codeLabel('eval'); qx.phase(180flip_one, ~0, counter.bits(1)); counter.phase(180flip_both, ~0); qc.codeLabel('Grover'); qx.Grover(counter.bits(1)); qc.codeLabel('invQFT'); counter.invQFT(); qc.codeLabel(''); counter.read(); } if (convert_to_beamsplitters) convertToPositionEncoding(qc.qReg.staff); if (swap_to_adjacent) qc.qReg.staff.migrateAdjacent1D(false, true);	Ready.

	var num_bits = 1; qc.reset(3 * num_bits); var alice = qint.new(num_bits, 'alice'); var epair1 = qint.new(num_bits, 'epair1'); var bob = qint.new(num_bits, 'bob (epair2)'); qc.codeLabel('entangle'); epair1.write(0); bob.write(0); epair1.hadamard(); bob.cnot(epair1); qc.codeLabel('prep'); alice.write(0); alice.roty(25); alice.phase(25); qc.codeLabel('send'); var a_bits = alice.teleport_send(epair1); qc.codeLabel('receive'); bob.teleport_receive(a_bits);	Ready.

4. Cluster States
Here we construct all of the different topological 4-bit cluster states. Notice: The program turns on the "color by phase" option, to make it easier to see the cluster states.	qc_options.color_by_phase = true; qc.reset(4); qc.codeLabel('Star'); qc.write(0); qc.hadamard(); qc.phase(180, 1\|2); qc.phase(180, 1\|4); qc.phase(180, 1\|8); qc.codeLabel('Complete'); qc.write(0); qc.hadamard(); qc.phase(180, 1\|2); qc.phase(180, 1\|4); qc.phase(180, 1\|8); qc.phase(180, 2\|4); qc.phase(180, 2\|8); qc.phase(180, 4\|8); qc.codeLabel('Kite'); qc.write(0); qc.hadamard(); qc.phase(180, 1\|2); qc.phase(180, 2\|4); qc.phase(180, 2\|8); qc.phase(180, 4\|8); qc.codeLabel('Square'); qc.write(0); qc.hadamard(); qc.phase(180, 1\|2); qc.phase(180, 2\|4); qc.phase(180, 1\|8); qc.phase(180, 4\|8); qc.codeLabel('Line'); qc.write(0); qc.hadamard(); qc.phase(180, 1\|2); qc.phase(180, 2\|4); qc.phase(180, 1\|8); qc.codeLabel('Diamond'); qc.write(0); qc.hadamard(); qc.phase(180, 1\|2); qc.phase(180, 1\|4); qc.phase(180, 1\|8); qc.phase(180, 2\|4); qc.phase(180, 2\|8);	Ready.

QCEngine Hands-On Introduction

Welcome!

2. Counter

3. Waveguides

4. Cluster States